Add CLA workflow (#53)

Author: glenn-jocher

.github/workflows/cla.yml

@@ -0,0 +1,32 @@
+# Ultralytics 🚀 AGPL-3.0 License - https://ultralytics.com/license
+
+# Ultralytics Contributor License Agreement (CLA) action https://docs.ultralytics.com/help/CLA
+# This workflow automatically requests Pull Requests (PR) authors to sign the Ultralytics CLA before PRs can be merged
+
+name: CLA
+on:
+  issue_comment:
+    types:
+      - created
+  pull_request_target:
+    types:
+      - reopened
+      - opened
+      - synchronize
+
+permissions:
+  actions: write
+  pull-requests: write
+
+jobs:
+  CLA:
+    if: github.event_name == 'pull_request_target' || (github.event.issue.pull_request && (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I sign the CLA'))
+    concurrency:
+      group: cla-${{ github.event.pull_request.number || github.event.issue.number }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: CLA
+        uses: ultralytics/actions/cla@main
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          cla-token: ${{ secrets._GITHUB_TOKEN }}