ci: add a workflow for linting pr titles (#2497)

.github/workflows/pull_request_title_lint.yaml

@@ -0,0 +1,51 @@
+name: "Lint Pull Request Titles"
+
+on:
+  pull_request_target:
+    types:
+      - opened
+      - edited
+      - synchronize
+
+permissions:
+  pull-requests: read
+
+jobs:
+  main:
+    name: Validate PR title
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@v5
+        id: lint_pr_title
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # Configure which types are allowed (newline-delimited).
+          # ref: CONTRIBUTING.md
+          types: |
+            feat
+            fix
+            docs
+            test
+            chore
+            perf
+            refactor
+          # Configure that a scope must always be provided.
+          requireScope: false
+          # Configure which scopes are disallowed in PR titles (newline-delimited).
+          # For instance by setting the value below, `chore(release): ...` (lowercase)
+          # and `ci(e2e,release): ...` (unknown scope) will be rejected.
+          # These are regex patterns auto-wrapped in `^ $`.
+          disallowScopes: |
+            release
+            [A-Z]+
+          # Configure additional validation for the subject based on a regex.
+          # This example ensures the subject doesn't start with an uppercase character.
+          subjectPattern: ^(?![A-Z]).+$
+          # If `subjectPattern` is configured, you can use this property to override
+          # the default error message that is shown when the pattern doesn't match.
+          # The variables `subject` and `title` can be used within the message.
+          subjectPatternError: |
+            The subject "{subject}" found in the pull request title "{title}"
+            didn't match the configured pattern. Please ensure that the subject
+            doesn't start with an uppercase character.

CONTRIBUTING.md

@@ -287,6 +287,8 @@ docs: fix link to website page
 test(lint): add more cases to handle invalid rules
 ```
 
+We are using [action-semantic-pull-request](https://github.com/amannn/action-semantic-pull-request) to lint the titles of pull requests. If the 'Lint Pull Request Titles' workflow fails, please correct the title.
+
 ## Creating pull requests
 
 When creating a new pull request, it's preferable to use a conventional commit-formatted title, as this title will be used as the default commit message on the squashed commit after merging.