OF-3326: Make Java 21 the default container runtime, add Java 25 variant

Author: Fishbowler

.github/workflows/continuous-integration-workflow.yml

@@ -76,9 +76,12 @@ jobs:
 
   build-docker:
 
-    name: Build Docker image
+    name: Build Docker image (Java ${{ matrix.java }})
     runs-on: ubuntu-latest
     needs: build
+    strategy:
+      matrix:
+        java: [21, 25]
 
     steps:
       - name: Checkout repository
@@ -96,17 +99,18 @@ jobs:
         with:
           context: .
           load: true
-          tags: ${{ env.IMAGE_NAME }}:ci-${{ github.sha }}
+          build-args: JAVA_VERSION=${{ matrix.java }}
+          tags: ${{ env.IMAGE_NAME }}:ci-java${{ matrix.java }}-${{ github.sha }}
           cache-from: type=gha,scope=openfire-${{ steps.cache-hash.outputs.hash }}
           cache-to: type=gha,mode=max,scope=openfire-${{ steps.cache-hash.outputs.hash }}
 
       - name: Save Docker image to tar archive
-        run: docker save ${{ env.IMAGE_NAME }}:ci-${{ github.sha }} | gzip > openfire-docker-image.tar.gz
+        run: docker save ${{ env.IMAGE_NAME }}:ci-java${{ matrix.java }}-${{ github.sha }} | gzip > openfire-docker-image.tar.gz
 
       - name: Upload Docker image archive
         uses: actions/upload-artifact@v7
         with:
-          name: Openfire Docker Image
+          name: Openfire Docker Image Java ${{ matrix.java }}
           path: openfire-docker-image.tar.gz
           retention-days: 1
 
@@ -121,13 +125,13 @@ jobs:
       - name: Download Docker image archive
         uses: actions/download-artifact@v8
         with:
-          name: Openfire Docker Image
+          name: Openfire Docker Image Java 21
           path: .
 
       - name: Load Docker image
         run: |
           docker load < openfire-docker-image.tar.gz
-          docker tag ${{ env.IMAGE_NAME }}:ci-${{ github.sha }} openfire:latest
+          docker tag ${{ env.IMAGE_NAME }}:ci-java21-${{ github.sha }} openfire:latest
 
       - name: Checkout Integration Tests
         uses: actions/checkout@v7
@@ -1258,10 +1262,13 @@ jobs:
           IGNITE_REALTIME_MAVEN_PASSWORD: ${{ secrets.IGNITE_REALTIME_MAVEN_PASSWORD }}
 
   publish-docker:
-    name: Publish to GitHub's Docker registry
+    name: Publish to GitHub's Docker registry (Java ${{ matrix.java }})
     runs-on: ubuntu-latest
     needs: [build-docker, aioxmpp, connectivity, integration, xitf, check_branch, hsqldb-install, hsqldb-upgrade, sqlserver-install, sqlserver-upgrade, postgres-install, postgres-upgrade, cockroachdb-install, cockroachdb-upgrade, firebird-install, firebird-upgrade, mysql-install, mysql-upgrade, mariadb-install, mariadb-upgrade, oracle-install, oracle-upgrade]
     if: ${{ github.repository == 'igniterealtime/Openfire' && github.event_name == 'push' && needs.check_branch.outputs.is_publishable_branch == 'true' }}
+    strategy:
+      matrix:
+        java: [21, 25]
 
     permissions:
       contents: read
@@ -1276,7 +1283,7 @@ jobs:
       - name: Download Docker image archive
         uses: actions/download-artifact@v8
         with:
-          name: Openfire Docker Image
+          name: Openfire Docker Image Java ${{ matrix.java }}
           path: .
 
       - name: Load Docker image
@@ -1289,19 +1296,28 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract metadata (tags, labels) for image registry
+      - name: Extract metadata (plain tags, default Java version only)
         id: meta
+        if: ${{ matrix.java == 21 }}
+        uses: docker/metadata-action@v6
+        with:
+          images: ${{ env.REGISTRY }}/igniterealtime/${{ env.IMAGE_NAME }}
+
+      - name: Extract metadata (versioned tags)
+        id: meta-versioned
         uses: docker/metadata-action@v6
         with:
           images: ${{ env.REGISTRY }}/igniterealtime/${{ env.IMAGE_NAME }}
+          flavor: suffix=-java${{ matrix.java }}
 
-      - name: Retag and push final image
+      - name: Tag and push image
         id: push
         run: |
-          FIRST_TAG=$(echo "${{ steps.meta.outputs.tags }}" | head -n1)
-          docker tag ${{ env.IMAGE_NAME }}:ci-${{ github.sha }} $FIRST_TAG
+          ALL_TAGS=$(printf '%s\n' "${{ steps.meta.outputs.tags }}" "${{ steps.meta-versioned.outputs.tags }}" | grep -v '^$')
+          FIRST_TAG=$(echo "$ALL_TAGS" | head -n1)
+          docker tag ${{ env.IMAGE_NAME }}:ci-java${{ matrix.java }}-${{ github.sha }} $FIRST_TAG
           DIGEST=$(docker push $FIRST_TAG | grep -oP 'digest: \K\S+')
-          for tag in $(echo "${{ steps.meta.outputs.tags }}" | tail -n +2); do
+          for tag in $(echo "$ALL_TAGS" | tail -n +2); do
             docker tag $FIRST_TAG $tag
             docker push $tag
           done

Dockerfile

@@ -1,7 +1,8 @@
 # This stage extracts all the pom.xml files.
 # It'll get rebuilt with any source change, but that's OK.
 # It doesn't matter what image we're using, really, so we may as well use one of the same images as elsewhere.
-FROM eclipse-temurin:17-jre AS poms
+ARG JAVA_VERSION=21
+FROM eclipse-temurin:${JAVA_VERSION}-jre AS poms
 WORKDIR /usr/src
 COPY . .
 # Wipe any files not called pom.xml or *.jar
@@ -10,7 +11,7 @@ RUN find . -type f -and \! -name pom.xml -and \! -name '*.jar' -delete
 RUN find . -type d -empty -delete
 
 # Now we build:
-FROM eclipse-temurin:17 AS build
+FROM eclipse-temurin:${JAVA_VERSION} AS build
 WORKDIR /tmp/
 WORKDIR /usr/src
 COPY mvnw ./
@@ -42,7 +43,7 @@ RUN sed -i 's/\r//g' /usr/src/distribution/target/distribution-base/bin/openfire
 
 # Might as well create the user in a different stage if only to eliminate
 # the ugly && chaining and increase parallelization
-FROM eclipse-temurin:17-jre AS skeleton-runtime
+FROM eclipse-temurin:${JAVA_VERSION}-jre AS skeleton-runtime
 
 ENV OPENFIRE_USER=openfire \
     OPENFIRE_DIR=/usr/local/openfire \
@@ -54,7 +55,7 @@ RUN apt-get install -yyq adduser
 RUN adduser --disabled-password --quiet --system --home $OPENFIRE_DATA_DIR --gecos "Openfire XMPP server" --group $OPENFIRE_USER
 
 # Final stage, build the runtime container:
-FROM eclipse-temurin:17-jre AS runtime
+FROM eclipse-temurin:${JAVA_VERSION}-jre AS runtime
 
 ENV OPENFIRE_USER=openfire \
     OPENFIRE_DIR=/usr/local/openfire \