Add CLA check action

Author: kneth

.github/workflows/cla-check.yml

@@ -0,0 +1,12 @@
+name: Check PR Author has signed CLA
+on:
+  pull_request_target:
+    branches:
+    - 'master'
+    types: [opened, synchronize, unlabeled]
+jobs:
+  check-author-signed-cla:
+    uses: crate/actions/.github/workflows/cla-check-workflow.yml@main
+    # with: 
+      # simulate_no_cla: true
+    secrets: inherit