Add release workflow.

.github/workflows/release.yml

@@ -0,0 +1,77 @@
+name: release
+
+on:
+  workflow_dispatch:
+    inputs:
+      release-version:
+        description: 'Version being released'
+        required: true
+      branch:
+        description: 'Branch to release from'
+        required: true
+        default: 'main'
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          java-version: 11
+          distribution: 'temurin'
+          server-id: central
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_CENTRAL_TOKEN
+          gpg-private-key: ${{ secrets.java_gpg_secret_key }}
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE
+
+      - id: install-secret-key
+        name: Install gpg secret key
+        run: |
+          cat <(echo -e "${{ secrets.java_gpg_secret_key }}") | gpg --batch --import
+          gpg --list-secret-keys --keyid-format LONG
+
+      - name: Compile
+        run: mvn --batch-mode clean install -DskipTests
+
+      - name: Setup Git
+        run: |
+          git config --global user.name "GitHub Actions"
+          git config --global user.email "actions@github.com"
+
+      - name: Set the version
+        run: |
+          mvn versions:set -DgenerateBackupPoms=false -DnewVersion=${{ github.event.inputs.release-version }}
+          git add .
+          git commit -m "Release version update ${{ github.event.inputs.release-version }}"
+          git push
+          git tag ${{ github.event.inputs.release-version }}
+          git push origin ${{ github.event.inputs.release-version }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Release to Maven Central
+        run: |
+          mvn --batch-mode deploy -Prelease -DskipTests=true
+        env:
+          MAVEN_USERNAME: ${{ secrets.central_username }}
+          MAVEN_CENTRAL_TOKEN: ${{ secrets.central_password }}
+          MAVEN_GPG_PASSPHRASE: ${{ secrets.java_gpg_passphrase }}
+
+      - name: Back to Snapshot
+        run: |
+          mvn versions:set -DgenerateBackupPoms=false -DnewVersion=9.9.9.9-SNAPSHOT
+          git add .
+          git commit -m "Snapshot version update"
+          git push
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}