ci: the container image name has to be lowercase

Signed-off-by: Davide Cavalca <[email protected]>

Author: davide125

.github/workflows/container.yml

@@ -7,6 +7,11 @@ on:
     branches:
       - main
 
+env:
+  REGISTRY: ghcr.io
+  # This has to be lowercase
+  IMAGE_NAME: asahilinux/mkdocs-asahi
+
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
@@ -18,7 +23,7 @@ jobs:
         uses: docker/login-action@v3
         if: github.event_name != 'pull_request'
         with:
-          registry: ghcr.io
+          registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Setup Docker Buildx
@@ -27,7 +32,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64,linux/arm64
-          tags: ghcr.io/AsahiLinux/mkdocs-asahi:latest
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
           push: ${{ github.event_name != 'pull_request' }}
           cache-from: type=gha
           cache-to: type=gha,mode=max