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simon-the-sharksimon-the-shark
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feat: add web-only docker image for flutter 3.44.1
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‎.github/workflows/publish.yml‎

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name: Publish Flutter web-only image
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on:
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push:
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branches:
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- main
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paths:
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- Dockerfile
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- versions.env
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- .github/workflows/publish.yml
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workflow_dispatch:
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permissions:
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contents: read
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packages: write
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env:
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REGISTRY: ghcr.io
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IMAGE_NAME: ${{ github.repository }}-web-only
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jobs:
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publish:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v6
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- name: Load versions
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id: versions
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shell: bash
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run: |
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set -a
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source versions.env
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set +a
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echo "flutter=$FLUTTER_STABLE_VERSION" >> "$GITHUB_OUTPUT"
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- name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v4
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- name: Log in to GHCR
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uses: docker/login-action@v4
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with:
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registry: ${{ env.REGISTRY }}
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Build and push
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uses: docker/build-push-action@v7
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with:
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context: .
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push: true
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build-args: |
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FLUTTER_STABLE_VERSION=${{ steps.versions.outputs.flutter }}
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tags: |
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${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.versions.outputs.flutter }}

‎.github/workflows/update-flutter.yml‎

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name: Update Flutter stable version
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on:
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schedule:
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- cron: "23 6 * * *"
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workflow_dispatch:
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permissions:
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contents: write
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pull-requests: write
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jobs:
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update:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v6
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- name: Find latest stable Flutter version
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id: latest
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shell: bash
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run: |
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set -euo pipefail
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latest=$(
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curl --fail --silent https://api.github.com/repos/flutter/flutter/releases/latest \
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| jq -r '.tag_name | sub("^v"; "")'
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)
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if [ -z "$latest" ] || [ "$latest" = "null" ]; then
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echo "Could not resolve latest Flutter release" >&2
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exit 1
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fi
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echo "version=$latest" >> "$GITHUB_OUTPUT"
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- name: Update versions.env
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id: update
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shell: bash
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run: |
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set -euo pipefail
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current=$(grep '^FLUTTER_STABLE_VERSION=' versions.env | cut -d= -f2- || true)
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if [ "$current" = "${{ steps.latest.outputs.version }}" ]; then
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echo "changed=false" >> "$GITHUB_OUTPUT"
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exit 0
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fi
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tmp=$(mktemp)
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awk -F= -v latest="${{ steps.latest.outputs.version }}" \
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'BEGIN { updated=0 } /^FLUTTER_STABLE_VERSION=/ { print "FLUTTER_STABLE_VERSION=" latest; updated=1; next } { print } END { if (!updated) print "FLUTTER_STABLE_VERSION=" latest }' \
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versions.env > "$tmp"
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mv "$tmp" versions.env
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echo "changed=true" >> "$GITHUB_OUTPUT"
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- name: Create pull request
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if: steps.update.outputs.changed == 'true'
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uses: peter-evans/create-pull-request@v8
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with:
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branch: bot/update-flutter-${{ steps.latest.outputs.version }}
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commit-message: Update Flutter to ${{ steps.latest.outputs.version }}
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title: Update Flutter to ${{ steps.latest.outputs.version }}
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body: |
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Updates the base image Flutter SDK version to `${{ steps.latest.outputs.version }}`.
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The publish workflow will build and push:
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- `ghcr.io/${{ github.repository }}-web-only:${{ steps.latest.outputs.version }}`
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labels: dependencies, flutter

‎Dockerfile‎

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FROM ubuntu:24.04
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ARG FLUTTER_STABLE_VERSION=3.44.1
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ENV DEBIAN_FRONTEND=noninteractive \
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FLUTTER_HOME=/opt/flutter \
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PATH=/opt/flutter/bin:/opt/flutter/bin/cache/dart-sdk/bin:/root/.pub-cache/bin:$PATH
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RUN apt-get update \
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&& apt-get install -y --no-install-recommends \
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ca-certificates \
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curl \
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file \
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git \
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jq \
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xz-utils \
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zip \
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&& rm -rf /var/lib/apt/lists/*
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RUN git clone --depth 1 --branch "$FLUTTER_STABLE_VERSION" https://github.com/flutter/flutter.git "$FLUTTER_HOME" \
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&& flutter config --no-analytics \
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&& flutter precache --web \
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&& flutter doctor -v

‎README.md‎

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# Flutter Web-Only Base Image
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Standalone GHCR image for Flutter web-only builds.
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Our custom version after discontinuation of the CirrusLabs image.
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## Image tags
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After pushing this directory as a repository, the publish workflow creates:
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- `ghcr.io/<owner>/<repo>-web-only:<flutter-version>`
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For this app, use for example:
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```dockerfile
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FROM ghcr.io/solvro/web-flutter-docker-image-web-only:3.44.1 AS build
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```
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## Versioning
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The pinned Flutter stable version lives in `versions.env` as `FLUTTER_STABLE_VERSION`.
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The scheduled updater checks the latest Flutter stable release and opens a PR that updates `versions.env`. Merging that PR triggers the publish workflow and pushes a new specific version tag.
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## Contents
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This image installs Flutter from the official Flutter git tag and pre-caches only web artifacts. It does not include the Android SDK, Java runtime, or Android command-line tools.

‎versions.env‎

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FLUTTER_STABLE_VERSION=3.44.1

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