ci: add github-workflow for CI release

This commit adds a new github-workflow to automate the release process
for the scylladb java driver,

This is the first stage of automation, including building and pushing
the project to the staging repository, which requires manual promotion
for the version,

The last step of promoting from staging to production (nexus OSS)
will be automated later, as I need to investigate an issue with the
nexus-staging:release command

Author: benipeled

.github/workflows/release.yml

@@ -0,0 +1,63 @@
+name: Release ScyllaDB Java Driver
+
+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-22.04
+
+    permissions:
+      contents: write
+
+    env:
+      MVNCMD: mvn -B -X -ntp
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v3
+
+    - name: Set up Java
+      uses: actions/setup-java@v3
+      with:
+        java-version: '8'
+        distribution: 'adopt'
+        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 "github-promoter@scylladb.com"
+
+    - 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 }}
+      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