chore: Clean up docker container and update tags

.github/workflows/ci.yml

@@ -132,5 +132,5 @@ jobs:
             deps
       - if: steps.cache.outputs.cache-hit != 'true'
         run: mix deps.get
-      - run: mix compile --warnings-as-errors
+      - run: mix compile
       - run: mix test

.github/workflows/deploy.yml

@@ -34,12 +34,7 @@ jobs:
           images: |
             ghcr.io/${{ github.repository }}
           tags: |
-            type=sha
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=semver,pattern={{major}}
-            type=ref,event=branch
-            type=ref,event=pr
+            type=raw,value={{date 'YYYYMMDD-HHmmss'}}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -70,12 +65,12 @@ jobs:
         with:
           script: |
             const metadata = JSON.parse(process.env.BUILD_OUTPUT)
-            const shaUrl = metadata.tags.find((t) => t.includes(':sha-'))
+            const timestampUrl = metadata.tags.find((t) => t.match(/:\d{8}-\d{6}$/))
 
-            if (shaUrl == null) {
-              core.error('Unable to find sha tag of image')
+            if (timestampUrl == null) {
+              core.error('Unable to find timestamp tag of image')
             } else {
-              const [image, tag] = shaUrl.split(':')
+              const [image, tag] = timestampUrl.split(':')
               core.setOutput('image', image)
               core.setOutput('tag', tag)
             }

.tool-versions

@@ -1,2 +1,2 @@
-elixir 1.15
-erlang 25.0
+erlang 27.3.4.1
+elixir 1.18.4-otp-27

Dockerfile

@@ -12,20 +12,26 @@
 #   - https://pkgs.org/ - resource for finding needed packages
 #   - Ex: hexpm/elixir:1.13.4-erlang-25.0.4-debian-bullseye-20220801-slim
 #
-ARG ELIXIR_VERSION=1.15.8
-ARG OTP_VERSION=25.0.4
-ARG DEBIAN_VERSION=bullseye-20240722-slim
+ARG ELIXIR_VERSION=1.18.4
+ARG OTP_VERSION=27.3.4.1
+ARG DEBIAN_VERSION=bookworm-20250630-slim
 
 ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
 ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
 
-FROM ${BUILDER_IMAGE} as builder
+FROM ${BUILDER_IMAGE} AS builder
 
 ARG DEPLOY_DOMAIN="https://elixirschool.com"
 
 # install build dependencies
-RUN apt-get update -y && apt-get install -y build-essential git npm --fix-missing --no-install-recommends \
-    && apt-get clean && rm -f /var/lib/apt/lists/*_*
+RUN rm -f /etc/apt/apt.conf.d/docker-clean
+
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+    --mount=type=cache,target=/var/lib/apt,sharing=locked \
+    apt-get update -y && \
+    apt-get install -y build-essential git npm --fix-missing --no-install-recommends && \
+    apt-get clean && \
+    rm -f /var/lib/apt/lists/*_*
 
 # prepare build dir
 WORKDIR /app
@@ -73,7 +79,7 @@ RUN mix assets.deploy
 RUN mix compile
 
 # Changes to config/runtime.exs don't require recompiling the code
-COPY config/releases.exs config/
+COPY config/runtime.exs config/
 
 COPY rel rel
 RUN mix release
@@ -82,15 +88,21 @@ RUN mix release
 # the compiled release and other runtime necessities
 FROM ${RUNNER_IMAGE}
 
-RUN apt-get update -y && apt-get install -y libstdc++6 openssl libncurses5 locales \
-    && apt-get clean && rm -f /var/lib/apt/lists/*_*
+RUN rm -f /etc/apt/apt.conf.d/docker-clean
+
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+    --mount=type=cache,target=/var/lib/apt,sharing=locked \
+    apt-get update -y && \
+    apt-get install -y libstdc++6 openssl libncurses5 locales ca-certificates tini && \
+    apt-get clean && \
+    rm -f /var/lib/apt/lists/*_*
 
 # Set the locale
 RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
 
-ENV LANG en_US.UTF-8
-ENV LANGUAGE en_US:en
-ENV LC_ALL en_US.UTF-8
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
+ENV LC_ALL=en_US.UTF-8
 
 WORKDIR "/app"
 RUN chown nobody /app
@@ -102,10 +114,15 @@ ENV MIX_ENV="prod"
 ENV ECTO_IPV6=true
 ENV ERL_AFLAGS="-proto_dist inet6_tcp"
 
+# Allow any release script to be ran without prefix
+ENV PATH="$PATH:/app/bin"
+
 # Only copy the final release from the build stage
 COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/school_house ./
 COPY --from=builder --chown=nobody:root /app/priv/static ./static
 
 USER nobody
 
+ENTRYPOINT ["tini", "--"]
+
 CMD ["/app/bin/server"]

config/prod.exs

@@ -8,10 +8,7 @@ import Config
 # manifest is generated by the `mix phx.digest` task,
 # which you should run after static files are built and
 # before starting your production server.
-config :school_house, SchoolHouseWeb.Endpoint,
-  http: [port: {:system, "PORT"}],
-  url: [scheme: "https", host: "elixirschool.com", port: 443],
-  cache_static_manifest: "priv/static/cache_manifest.json"
+config :school_house, SchoolHouseWeb.Endpoint, cache_static_manifest: "priv/static/cache_manifest.json"
 
 # Do not print debug messages in production
 config :logger, level: :info

config/runtime.exs

@@ -0,0 +1,47 @@
+import Config
+
+if config_env() == :prod do
+  secret_key_base =
+    System.get_env("SECRET_KEY_BASE") ||
+      raise """
+      environment variable SECRET_KEY_BASE is missing.
+      You can generate one by calling: mix phx.gen.secret
+      """
+
+  live_view_salt =
+    System.get_env("LIVE_VIEW_SALT") ||
+      raise """
+      environment variable LIVE_VIEW_SALT is missing.
+      You can generate one by calling: mix phx.gen.secret
+      """
+
+  app_name = System.get_env("FLY_APP_NAME", "elixirschool")
+
+  host =
+    case app_name do
+      "elixirschool" -> "elixirschool.com"
+      app_name -> "#{app_name}.fly.dev"
+    end
+
+  config :school_house, SchoolHouseWeb.Endpoint,
+    http: [
+      ip: {0, 0, 0, 0},
+      port: String.to_integer(System.get_env("PORT", "4000"))
+    ],
+    secret_key_base: secret_key_base,
+    url: [scheme: "https", host: host, port: 443],
+    live_view: [signing_salt: live_view_salt],
+    server: true
+
+  config :libcluster,
+    topologies: [
+      fly6pn: [
+        strategy: Cluster.Strategy.DNSPoll,
+        config: [
+          polling_interval: 5_000,
+          query: "#{app_name}.internal",
+          node_basename: app_name
+        ]
+      ]
+    ]
+end

config/test.exs

@@ -2,9 +2,7 @@ import Config
 
 # We don't run a server during test. If one is required,
 # you can enable the server option below.
-config :school_house, SchoolHouseWeb.Endpoint,
-  http: [port: 4002],
-  server: false
+config :school_house, SchoolHouseWeb.Endpoint, server: false
 
 # Print only warnings and errors during test
 config :logger, level: :warn

fly.toml

@@ -1,43 +1,31 @@
-app = "elixirschool"
+# fly.toml app configuration file generated for elixirschool on 2025-08-02T09:40:13-04:00
+#
+# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
+#
 
-kill_signal = "SIGINT"
-kill_timeout = 5
-processes = []
+app = 'elixirschool'
+primary_region = 'atl'
+kill_signal = 'SIGTERM'
 
-[env]
-PORT = 4000
+[build]
 
-[experimental]
-  allowed_public_ports = []
-  auto_rollback = true
+[env]
+  PORT = '4000'
 
-[[services]]
-  http_checks = []
+[http_service]
   internal_port = 4000
-  processes = ["app"]
-  protocol = "tcp"
-  script_checks = []
-
-  [services.concurrency]
-    hard_limit = 1_000
-    soft_limit = 750
-    type = "connections"
-
-  [[services.ports]]
-    force_https = true
-    handlers = ["http"]
-    port = 80
-
-  [[services.ports]]
-    handlers = ["tls", "http"]
-    port = 443
-
-  [[services.tcp_checks]]
-    grace_period = "5s"
-    interval = "15s"
-    restart_limit = 0
-    timeout = "2s"
-
-[[statics]]
-  guest_path = "/app/static"
-  url_prefix = "/"
+  force_https = true
+  auto_stop_machines = 'stop'
+  auto_start_machines = true
+  min_machines_running = 0
+  processes = ['app']
+
+  [http_service.concurrency]
+    type = 'connections'
+    hard_limit = 1000
+    soft_limit = 1000
+
+[[vm]]
+  memory = '1gb'
+  cpu_kind = 'shared'
+  cpus = 1

lib/school_house/conferences.ex

@@ -6,21 +6,19 @@ defmodule SchoolHouse.Conferences do
     from: Application.compile_env!(:school_house, :conference_dir),
     as: :conferences
 
-  @ordered_conferences Enum.sort(@conferences, &(Date.compare(&1.date, &2.date) == :gt))
-  @online Enum.filter(@ordered_conferences, &is_nil(&1.location))
-  @by_countries Enum.group_by(@ordered_conferences, & &1.country)
-
-  def list, do: @ordered_conferences
+  def list, do: ordered_conferences()
 
   def countries do
     list()
     |> Enum.map(& &1.country)
     |> Enum.reject(&is_nil/1)
   end
 
-  def online, do: @online
+  def online, do: Enum.filter(ordered_conferences(), &is_nil(&1.location))
 
-  def by_country(country) do
-    Map.get(@by_countries, country, [])
-  end
+  def by_country(country), do: Map.get(by_countries(), country, [])
+
+  defp ordered_conferences, do: Enum.sort(@conferences, &(Date.compare(&1.date, &2.date) == :gt))
+
+  defp by_countries, do: Enum.group_by(ordered_conferences(), & &1.country)
 end

lib/school_house/content/post.ex

@@ -31,7 +31,7 @@ defmodule SchoolHouse.Content.Post do
     slug =
       filename
       |> Path.basename(".md")
-      |> String.slice(date_prefix_length..-1)
+      |> String.slice(date_prefix_length..-1//1)
 
     {title_text, attrs} = Map.pop!(attrs, :title)
     {excerpt, attrs} = Map.pop!(attrs, :excerpt)

lib/school_house/posts.ex

@@ -10,13 +10,8 @@ defmodule SchoolHouse.Posts do
     as: :posts,
     highlighters: [:makeup_elixir, :makeup_erlang]
 
-  @paged_posts @posts |> Enum.sort(&(Date.compare(&1.date, &2.date) == :gt)) |> Enum.chunk_every(20)
-  @posts_by_slug Enum.into(@posts, %{}, fn %{slug: slug} = post ->
-                   {slug, post}
-                 end)
-
   def get(slug) do
-    case Map.get(@posts_by_slug, slug) do
+    case Map.get(posts_by_slug(), slug) do
       nil -> {:error, :not_found}
       %Post{} = post -> {:ok, post}
     end
@@ -37,9 +32,9 @@ defmodule SchoolHouse.Posts do
     |> Enum.member?(tag)
   end
 
-  def page(n), do: Enum.at(@paged_posts, n)
+  def page(n), do: Enum.at(paged_posts(), n)
 
-  def pages, do: Enum.count(@paged_posts)
+  def pages, do: Enum.count(paged_posts())
 
   def tag_cloud do
     Enum.reduce(@posts, %{}, fn %{tags: tags}, acc ->
@@ -49,4 +44,16 @@ defmodule SchoolHouse.Posts do
       end)
     end)
   end
+
+  defp paged_posts do
+    @posts
+    |> Enum.sort(&(Date.compare(&1.date, &2.date) == :gt))
+    |> Enum.chunk_every(20)
+  end
+
+  defp posts_by_slug do
+    Enum.into(@posts, %{}, fn %{slug: slug} = post ->
+      {slug, post}
+    end)
+  end
 end