ci: add workflow to check PR style

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

.github/workflows/prlint.yaml

@@ -0,0 +1,28 @@
+name: Check PR style
+
+on:
+  pull_request_target:
+    types:
+      - opened
+      - reopened
+      - edited
+      - synchronize
+
+jobs:
+  title-lint:
+    runs-on: ubuntu-latest
+    permissions:
+      statuses: write
+    steps:
+      - uses: aslafy-z/conventional-pr-title-action@v3
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  check-pr-description:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: jadrol/pr-description-checker-action@v1.0.0
+        id: description-checker
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          exempt-labels: no qa