chore(ci): Add release workflow (#2)

Author: erezrokah

.github/workflows/release_pr.yml

@@ -0,0 +1,21 @@
+name: release-please
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: google-github-actions/release-please-action@v3
+        id: release
+        with:
+          release-type: python
+          package-name: plugin-pb-python
+          token: ${{ secrets.GH_CQ_BOT }}
+          pull-request-title-pattern: "chore${scope}: Release${component} v${version}"
+          # Should breaking changes before 1.0.0 produce minor bumps?
+          bump-minor-pre-major: true
+          # Should feat changes before 1.0.0 produce patch bumps instead of minor bumps?
+          bump-patch-for-minor-pre-major: true