CI to build image and push to github registry

.github/workflows/docker-build.yml

@@ -0,0 +1,72 @@
+name: Build and Push Docker Images
+
+on:
+  push:
+    branches: [ main ]
+  release:
+    types: [ published ]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    - name: Build with Maven
+      run: mvn clean package -DskipTests
+
+    - name: Copy JAR to docker directory
+      run: |
+        rm -fv docker/plugins/*.jar
+        mkdir -p docker/plugins/
+        cp -pv ./target/keycloak-facilities-admin-plugin-*.jar docker/plugins/
+
+    - name: Extract Keycloak version from pom.xml
+      id: version
+      run: |
+        VERSION=$(grep -oP '(?<=<keycloak.version>)[^<]+' pom.xml)
+        echo "keycloak_version=$VERSION" >> $GITHUB_OUTPUT
+
+    - name: Log in to Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+        tags: |
+          type=ref,event=branch
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v5
+      with:
+        context: ./docker
+        push: true
+        tags: |
+          ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+          ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}
+        build-args: |
+          KEYCLOAK_IMAGE=quay.io/keycloak/keycloak:${{ steps.version.outputs.keycloak_version }}
+        labels: ${{ steps.meta.outputs.labels }}