chore(ci): add release workflow

.github/workflows/ci.yml

@@ -2,11 +2,10 @@ name: Continuous Integration
 
 on:
   push:
-    branches: [main]
-  pull_request:
-    branches: [main]
+    branches:
+      - main
+  pull_request: ~
 
-# Cancel any in-progress CI runs for a PR if it is updated
 concurrency:
   group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
@@ -52,3 +51,17 @@ jobs:
           export VIM="${PWD}/_neovim/share/nvim/runtime"
           nvim --version
           make test
+
+  release:
+    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    runs-on: ubuntu-latest
+    needs:
+      - tests
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ secrets.RELEASE_PLEASE_TOKEN }}
+          release-type: simple