chore: add check actions workflow (#11)

Signed-off-by: Charles-Edouard Brétéché <[email protected]>

.github/workflows/check-actions.yaml

@@ -0,0 +1,31 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+
+name: Check actions
+
+permissions: {}
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  required:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: Ensure SHA pinned actions
+        uses: zgosalvez/github-actions-ensure-sha-pinned-actions@ba37328d4ea95eaf8b3bd6c6cef308f709a5f2ec # v3.0.3
+        with:
+          # slsa-github-generator requires using a semver tag for reusable workflows. 
+          # See: https://github.com/slsa-framework/slsa-github-generator#referencing-slsa-builders-and-generators
+          allowlist: |
+            slsa-framework/slsa-github-generator