Publish maven artifacts to GH Packages (#305)

Provide reusable maven ci workflow.
Publish `maven-conf` and `org.eclipse.theia.cloud.common`.
Publish `org.eclipse.theia.cloud.operator` and `org.eclipse.theia.cloud.service`.
Always resolve `maven-conf` and `org.eclipse.theia.cloud.common` locally.
Update `actions/setup-java@v3` to `actions/setup-java@v4`.
Remove the service tests, as they are indirectly run via the maven build.

.github/workflows/ci-maven-common.yml

@@ -0,0 +1,24 @@
+name: Maven org.eclipse.theia.cloud.common CI
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "java/common/**"
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "java/common/**"
+  release:
+    types:
+      - published
+
+jobs:
+  call-reusable-maven-workflow:
+    permissions:
+      packages: write
+    uses: ./.github/workflows/reusable-maven.yml
+    with:
+      path_to_package: common/org.eclipse.theia.cloud.common/

.github/workflows/ci-maven-conf.yml

@@ -0,0 +1,24 @@
+name: Maven config CI
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "java/common/maven-conf/**"
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "java/common/maven-conf/**"
+  release:
+    types:
+      - published
+
+jobs:
+  call-reusable-maven-workflow:
+    permissions:
+      packages: write
+    uses: ./.github/workflows/reusable-maven.yml
+    with:
+      path_to_package: common/maven-conf/

.github/workflows/ci-maven-operator.yml

@@ -0,0 +1,27 @@
+name: Maven org.eclipse.theia.cloud.operator CI
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "java/common/**"
+      - "java/operator/org.eclipse.theia.cloud.operator/**"
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "java/common/**"
+      - "java/operator/org.eclipse.theia.cloud.operator/**"
+  release:
+    types:
+      - published
+
+jobs:
+  call-reusable-maven-workflow:
+    permissions:
+      packages: write
+    uses: ./.github/workflows/reusable-maven.yml
+    with:
+      path_to_package: operator/org.eclipse.theia.cloud.operator/
+      dependencies: common/maven-conf/,common/org.eclipse.theia.cloud.common/

.github/workflows/ci-maven-service.yml

@@ -0,0 +1,26 @@
+name: Maven org.eclipse.theia.cloud.service CI
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "java/common/**"
+      - "java/service/org.eclipse.theia.cloud.service/**"
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "java/common/**"
+      - "java/service/org.eclipse.theia.cloud.service/**"
+  release:
+    types:
+      - published
+
+jobs:
+  call-reusable-maven-workflow:
+    permissions:
+      packages: write
+    uses: ./.github/workflows/reusable-maven.yml
+    with:
+      path_to_package: service/org.eclipse.theia.cloud.service/
+      dependencies: common/maven-conf/,common/org.eclipse.theia.cloud.common/

.github/workflows/reusable-maven.yml

@@ -0,0 +1,98 @@
+name: Reusable workflow for maven packages
+
+on:
+  workflow_call:
+    inputs:
+      path_to_package:
+        required: true
+        type: string
+      dependencies:
+        description: "List of paths to dependencies. Entries are relative to the java directory and separated by comma (no whitespaces)."
+        required: false
+        type: string
+
+defaults:
+  run:
+    working-directory: java
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+
+    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 dependencies
+        if: ${{ inputs.dependencies != '' }}
+        run: |
+          IFS=',' read -r -a dirs <<< "${{ inputs.dependencies }}"
+          for dir in "${dirs[@]}"
+          do
+            cd "$dir"
+            mvn clean install --no-transfer-progress
+            cd -
+          done
+
+      - name: Verify package
+        run: |
+          cd ${{ inputs.path_to_package }}
+          mvn verify -fae --no-transfer-progress
+
+  check-version:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' || github.event_name == 'release'
+    outputs:
+      is_snapshot_version: ${{ steps.version_check.outputs.is_snapshot_version }}
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - id: version_check
+        run: |
+          cd ${{ inputs.path_to_package }}
+          VERSION=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout)
+          if [[ "$VERSION" == *-SNAPSHOT ]]; then
+            echo "is_snapshot_version=true" >> $GITHUB_OUTPUT
+          else
+            echo "is_snapshot_version=false" >> $GITHUB_OUTPUT
+          fi
+
+  publish:
+    runs-on: ubuntu-latest
+    needs: check-version
+    if: (github.event_name == 'push' && needs.check-version.outputs.is_snapshot_version == 'true') || (github.event_name == 'release' && needs.check-version.outputs.is_snapshot_version == 'false')
+
+    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 dependencies
+        if: ${{ inputs.dependencies != '' }}
+        run: |
+          IFS=',' read -r -a dirs <<< "${{ inputs.dependencies }}"
+          for dir in "${dirs[@]}"
+          do
+            cd "$dir"
+            mvn clean install --no-transfer-progress
+            cd -
+          done
+
+      - name: Publish package
+        run: |
+          cd ${{ inputs.path_to_package }}
+          mvn --batch-mode deploy
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

java/common/maven-conf/pom.xml

@@ -27,4 +27,12 @@
 		<webhooks.framework.core.version>1.1.2</webhooks.framework.core.version>
 	</properties>
 
+	<distributionManagement>
+		<repository>
+		<id>github</id>
+		<name>GitHub Packages</name>
+		<url>https://maven.pkg.github.com/eclipsesource/theia-cloud</url>
+		</repository>
+	</distributionManagement>
+
 </project>