Dockerize Keycloak

.github/workflows/registry-build-publish.yaml

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+name: Build and publish to Github Container Registry
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*.*.*']
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-images:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      pull-requests: write  # Add permission to write to pull requests
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          flavor: |
+            latest=auto
+            prefix=
+            suffix=
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Find Comment
+        if: github.event_name == 'pull_request'
+        uses: peter-evans/find-comment@v3
+        id: fc
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: The Docker image was built successfully with the following name
+
+      - name: Comment on pull request
+        if: github.event_name == 'pull_request'
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          issue-number: ${{ github.event.pull_request.number }}
+          edit-mode: replace
+          body: |
+            The Docker image was built successfully with the following name:
+            ```
+            ${{ steps.meta.outputs.tags }}
+            ```

.github/workflows/registry-pr-purge.yaml

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+name: Purge Pull Request Image
+
+# https://docs.github.com/en/actions/reference/events-that-trigger-workflows#registry_package
+# Purge Pull Request Image
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  purge_pr_image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Purge Pull Request Image
+        uses: vlaurin/action-ghcr-prune@v0.6.0
+        with:
+          token: ${{ secrets.GHCR_TOKEN}}
+          organization: ${{ github.repository_owner}}
+          container: ${{ github.event.repository.name }}
+          tag-regex: pr-${{github.event.pull_request.number}}$

.github/workflows/registry-purge.yaml

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+# https://docs.github.com/en/actions/reference/events-that-trigger-workflows#registry_package
+# Run cleanup job if a new package was published or updated
+name: Purge untagged images
+
+on:
+  registry_package:
+
+jobs:
+  purge_untagged_images:
+    runs-on: ubuntu-latest
+    steps:
+      - name: clean packages
+        uses: vlaurin/action-ghcr-prune@v0.6.0
+        with:
+          token: ${{ secrets.GHCR_TOKEN }}
+          organization: ${{ github.repository_owner }}
+          container: ${{ github.event.repository.name }}
+          untagged: true

Dockerfile

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+# Stage 1: Download the theme
+FROM alpine:latest AS loader
+RUN apk add --no-cache curl
+RUN curl -L -o /kc-foodmission-theme.jar \
+    "https://github.com/reedu-reengineering-education/foodmission-keycloak/releases/latest/download/keycloak-theme-for-kc-all-other-versions.jar"
+
+# Stage 2: Final Keycloak image
+FROM quay.io/keycloak/keycloak:26.3
+COPY --from=loader /kc-foodmission-theme.jar /opt/keycloak/providers/
+# Keycloak images usually handle permissions for the providers folder automatically,
+# but you can add this if needed:
+USER root
+RUN chown 1000:0 /opt/keycloak/providers/kc-foodmission-theme.jar
+USER 1000