Add release workflow

Nearly identical to the java-driver one.
Uses different java version.

Author: Bouncheck

.github/workflows/release.yml

@@ -0,0 +1,64 @@
+name: Release scylla-cdc-java
+
+on:
+  workflow_dispatch:
+    inputs:
+      dryrun:
+        type: boolean
+        description: 'dryrun: run without pushing SCM changes to upstream'
+        default: true
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    env:
+      MVNCMD: mvn -B -X -ntp
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+          server-id: ossrh
+          gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
+          server-username: OSSRH_USERNAME
+          server-password: OSSRH_PASSWORD
+
+      - name: Configure Git user
+        run: |
+          git config user.name "ScyllaDB Promoter"
+          git config user.email "[email protected]"
+
+      - name: Clean project
+        run: $MVNCMD clean
+
+      - name: Clean release
+        run: $MVNCMD release:clean
+
+      - name: Prepare release
+        env:
+          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+        run: $MVNCMD release:prepare -DpushChanges=false -Dgpg.passphrase=${{ secrets.GPG_PASSPHRASE }}
+
+      - name: Perform release
+        env:
+          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+          OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
+        if: ${{ github.event.inputs.dryrun == 'false' }}
+        run: $MVNCMD release:perform -Dgpg.passphrase=${{ secrets.GPG_PASSPHRASE }}
+
+      - name: Push changes to SCM
+        if: ${{ github.event.inputs.dryrun == 'false' }}
+        run: |
+          git status && git log -3
+          git push origin --follow-tags -v