Pipeline for releasing Docker init container

.github/workflows/release-github-tag.yml

@@ -0,0 +1,54 @@
+name: Publish package as Github release & Docker init container
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  release-github-tag:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-java@v3
+        with:
+          distribution: 'adopt'
+          java-version: '17'
+
+      - name: Build a project & run unit tests
+        run: ./gradlew test
+
+      - name: Get the tag name
+        run: echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
+
+      - name: Set version from git tag
+        run: ./gradlew jar -P version=${{ env.TAG }}
+
+      - name: Add jar to Github release
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: build/libs/keycloak-metrics-spi-${{ env.TAG }}.jar
+          asset_name: keycloak-metrics-spi-${{ env.TAG }}.jar
+          tag: ${{ github.ref }}
+
+      - name: Build Docker init container
+        run: |
+          docker build \
+          --build-arg VERSION=${{ env.TAG }} \
+          -f src/main/docker/initContainer.Dockerfile \
+          -t aerogear/keycloak-metrics-spi:${{ env.TAG }} \
+          -t aerogear/keycloak-metrics-spi:latest \
+          .
+
+      - name: Log into Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: aerogear
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: Push tagged Docker image
+        run: docker push aerogear/keycloak-metrics-spi:${{ env.TAG }}
+
+      - name: Push latest Docker image
+        run: docker push aerogear/keycloak-metrics-spi:latest

README.md

@@ -84,6 +84,35 @@ touch keycloak-metrics-spi-2.0.2.jar.dodeploy
 ```
 - Restart the keycloak service.
 
+#### Using Docker init container
+If you are running Keycloak using Helm charts, here is a ready init container build on busybox. Provider jar file is placed in `/keycloak-metrics-spi` directory, so
+according to official Keycloak [example](https://github.com/codecentric/helm-charts/blob/master/charts/keycloak/README.md#providing-a-custom-theme),
+your Helm chart could look like following:
+```yaml
+extraInitContainers: |
+  - name: keycloak-metrics-spi
+    image: aerogear/keycloak-metrics-spi:latest
+    imagePullPolicy: IfNotPresent
+    command:
+      - sh
+    args:
+      - -c
+      - |
+        echo "Copying keycloak-metrics-spi..."
+        cp -R /keycloak-metrics-spi/*.jar /keycloak-metrics-spi
+    volumeMounts:
+      - name: keycloak-metrics-spi
+        mountPath: /keycloak-metrics-spi
+
+extraVolumeMounts: |
+  - name: keycloak-metrics-spi
+    mountPath: /opt/jboss/keycloak/standalone/deployments
+
+extraVolumes: |
+  - name: keycloak-metrics-spi
+    emptyDir: {}
+``` 
+
 ### On Keycloak Quarkus Distribution
 
 > We assume the home of keycloak is on the default `/opt/keycloak`

build.gradle

@@ -13,7 +13,6 @@ configurations {
 }
 
 group 'org.jboss.aerogear'
-version '4.0.1-SNAPSHOT'
 
 apply plugin: 'java'
 

gradle.properties

@@ -1,2 +1,3 @@
+version=4.0.1-SNAPSHOT
 keycloakVersion=22.0.0
 prometheusVersion=0.16.0

src/main/docker/initContainer.Dockerfile

@@ -0,0 +1,5 @@
+FROM busybox
+
+ARG VERSION
+
+COPY build/libs/keycloak-metrics-spi-${VERSION}.jar /keycloak-metrics-spi/