ci(release): setup release-please for managing releases and changelog (#4)

.github/workflows/ci.yml

@@ -137,3 +137,16 @@ jobs:
           github-token: ${{ secrets.GH_PUSH_TOKEN }}
           comment-on-alert: true
           auto-push: true
+
+  release-please:
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/main'
+    outputs:
+      release_created: ${{ steps.release-please.outputs.release_created }}
+      version: ${{ steps.release-please.outputs.version }}
+    steps:
+      - uses: jimeh/release-please-manifest-action@v1
+        id: release-please
+        with:
+          app-id: ${{ secrets.RELEASE_BOT_APP_ID }}
+          private-key: ${{ secrets.RELEASE_BOT_PRIVATE_KEY }}