feat: Github action to verify format of PR titles.

.github/workflows/pr-title-check.yml

@@ -0,0 +1,27 @@
+name: PR Title Lint
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize]
+
+jobs:
+  pr-title-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+
+      - name: Run PR title linter
+        run: |
+          TITLE=$(jq -r .pull_request.title "$GITHUB_EVENT_PATH")
+          if [[ ! "$TITLE" =~ ^(fix|feat|docs|style|refactor|perf|test|chore):\ .{1,50}$ ]]; then
+            echo "Invalid PR title: $TITLE"
+            echo "PR titles must start with one of the following types: fix, feat, docs, style, refactor, perf, test, chore."
+            echo "Followed by a colon and space, and a brief description (1-50 characters)."
+            exit 1
+          fi

CONTRIBUTING.md

@@ -185,6 +185,32 @@ It is a good practice to keep your branch updated by rebasing your branch to mai
 * If you feel like your PR is waiting too long for a review, feel free to ping the [`#thanos-dev`](https://slack.cncf.io/) channel on our slack for a review!
 * If you are a new contributor with no write access, you can tag in the respective maintainer for the changes, but be patient enough for the reviews. *Remember, good things take time :)*
 
+### Pull Request Guidelines
+
+To ensure a consistent and meaningful naming convention for pull requests (PRs), please follow these guidelines:
+
+#### PR Title Format
+
+PR titles should follow this pattern:
+- `type: brief description`
+
+Where `type` is one of the following:
+- `fix`: A bug fix
+- `feat`: A new feature
+- `docs`: Documentation changes
+- `style`: Code style changes (formatting, missing semi-colons, etc.)
+- `refactor`: Code refactoring without changing functionality
+- `perf`: Performance improvements
+- `test`: Adding or updating tests
+- `chore`: Maintenance tasks (dependency updates, tool changes, etc.)
+
+#### Examples
+- `fix: Correct typo in README`
+- `feat: Add new storage backend support`
+- `docs: Update contributing guidelines`
+
+Failure to follow this convention will result in a failing check on your PR.
+
 ### Dependency management
 
 The Thanos project uses [Go modules](https://golang.org/cmd/go/#hdr-Modules__module_versions__and_more) to manage dependencies on external packages. This requires a working Go environment with version 1.11 or greater and git installed.