ci: add conventional commit message check

.github/workflows/lua_language_server.yml

@@ -1,4 +1,4 @@
-name: Run Lua Language Server check
+name: Lua Language Server Check
 
 on:
   workflow_call:

.github/workflows/nightly_check.yml

@@ -1,4 +1,4 @@
-name: Nightly Neovim check
+name: Nightly Neovim Check
 # Checks LSP and unit tests against new Neovim nightly once a week
 
 on:

.github/workflows/pr_check.yml

@@ -1,4 +1,4 @@
-name: Pull request check
+name: Pull Request Check
 
 on:
   pull_request:
@@ -54,3 +54,28 @@ jobs:
       - uses: actions/checkout@v2
       - name: Block Fixup Commit Merge
         uses: 13rac1/[email protected]
+
+  conventional-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Check Commit Messages
+        run: |
+          commits=$(git log --no-merges --pretty=format:"%s" HEAD~${{ github.event.pull_request.commits }}..HEAD)
+          bad_commits=()
+          for commit in "$commits"; do
+            if ! echo $commit | grep -qE "^(build|chore|ci|docs|feat|fix|perf|refactor|revert|style|test)(\(.+\))?: .+"; then
+              bad_commits+=("$commit")
+            fi
+          done
+          if [[ ${#bad_commits[@]} -ne 0 ]]; then
+            echo "The following commits do not follow the Conventional Commit format:"
+            for bad_commit in "${bad_commits[@]}"; do
+              echo "  - $bad_commit"
+            done
+            exit 1
+          fi

.github/workflows/tests.yml

@@ -1,4 +1,4 @@
-name: Run tests
+name: Unit Tests
 
 on:
   workflow_call: