ci: lint pull request title (#324)

.github/workflows/ci.yaml

@@ -5,6 +5,18 @@ on:
     branches: main
 
 jobs:
+  commitlint:
+    runs-on: ubuntu-latest
+    name: commitlint
+    if: github.event_name == 'pull_request'
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Deps
+        run: yarn install
+      - name: Lint PR Title
+        run: echo "${{ github.event.pull_request.title }}" | yarn commitlint
+
   tests:
     runs-on: ubuntu-latest
     name: Test (${{matrix.elixir}}/${{matrix.otp}})

.gitignore

@@ -30,3 +30,4 @@ result
 # Ignore dialyzer plt files
 /priv/plts/*.plt
 /priv/plts/*.plt.hash
+node_modules

commitlint.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  extends: ['@commitlint/config-conventional']
+}

package.json

@@ -0,0 +1,9 @@
+{
+  "scripts": {
+    "commitlint": "commitlint"
+  },
+  "dependencies": {
+    "@commitlint/config-conventional": "^18.1.0",
+    "commitlint": "^18.2.0"
+  }
+}