fix: add missing pr title lint action (#1032)

This workflow was never committed in PR #1015 so I fixed the
`.gitignore` too

.github/workflows/pr.yml

@@ -0,0 +1,14 @@
+name: PR
+on:
+  pull_request:
+    types: [opened, edited, synchronize]
+  pull_request_target:
+    types: [opened, edited, synchronize]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@0b14f54ac155d88e12522156e52cb6e397745cfd
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -21,6 +21,8 @@ dist/**/*.js
 !yarn.lock
 !.circleci
 !.github
+!.github/
+!.github/**
 !release.config.js
 !.*ignore
 !readme.md