Add a GitHub action for the release.

.github/workflows/release.yml

@@ -0,0 +1,42 @@
+name: Release
+
+on:
+  on:
+    workflow_dispatch:
+
+jobs:
+  release-sbt:
+    runs-on: ubuntu-latest
+    name: Release Scala Artifacts
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - uses: coursier/cache-action@v5
+
+      - name: Setup Scala
+        uses: olafurpg/setup-scala@v15
+        with:
+          java-version: "adopt@1.8"
+
+      - name: Import GPG Key
+        run: echo "${{ secrets.SONATYPE_GPG_KEY }}" | base64 --decode > gpg-secret-key.asc
+        shell: bash
+
+      - name: Import GPG Public Key
+        run: gpg --import --batch gpg-secret-key.asc
+        shell: bash
+
+      - name: Run the release plugin
+        working-directory: ./pramen
+        run: sbt releaseNow
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          commit-message: "Release version ${{ steps.release.outputs.version }}"
+          branch: release/${{ steps.release.outputs.version }}
+          title: "Release version ${{ steps.release.outputs.version }}"
+          body: "Automated release created by GitHub Action."
+          token: ${{ secrets.GITHUB_TOKEN }}