ci: replace commitlint with PR title validation (#8)

Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: zeitlinger

.commitlintrc.yml

@@ -4,6 +4,7 @@ LOG_LEVEL=ERROR
 
 # Disable linters not relevant for this repository
 VALIDATE_CHECKOV=false
+VALIDATE_GIT_COMMITLINT=false
 VALIDATE_JSCPD=false
 # Use Biome instead of Prettier for JSON formatting (Biome uses tabs, Prettier uses spaces)
 VALIDATE_JSON_PRETTIER=false

.github/config/super-linter.env

@@ -0,0 +1,18 @@
+---
+name: PR Title
+
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+permissions:
+  pull-requests: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
+        env:
+          GITHUB_TOKEN: ${{ github.token }}

.github/workflows/pr-title.yml

@@ -73,7 +73,7 @@ When adding new lint scripts, follow these patterns:
 
 ## Commit Messages
 
-This repository uses [Conventional Commits](https://www.conventionalcommits.org/) format, enforced by commitlint via Super-Linter. All commit messages must follow this format:
+This repository uses [Conventional Commits](https://www.conventionalcommits.org/) format for PR titles (enforced by CI). Since we use squash merges, the PR title becomes the commit message on main. PR titles must follow this format:
 
 ```text
 type(optional scope): description