ci: add CLA workflow

Author: aconite33

.github/workflows/cla.yml

@@ -0,0 +1,39 @@
+name: "CLA Assistant"
+on:
+  issue_comment:
+    types: [created]
+  pull_request_target:
+    types: [opened, closed, synchronize]
+
+permissions:
+  actions: write
+  contents: write
+  pull-requests: write
+  statuses: write
+
+jobs:
+  CLAAssistant:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate token from GitHub App
+        id: app-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.APP_ID }}
+          private-key: ${{ secrets.APP_PRIVATE_KEY }}
+          owner: blacklanternsecurity
+          repositories: CLA
+
+      - name: "CLA Assistant"
+        if: (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
+        uses: contributor-assistant/github-action@v2.6.1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PERSONAL_ACCESS_TOKEN: ${{ steps.app-token.outputs.token }}
+        with:
+          path-to-signatures: "signatures/version1/cla.json"
+          path-to-document: "https://github.com/blacklanternsecurity/CLA/blob/main/ICLA.md"
+          branch: "main"
+          allowlist: "dependabot[bot],github-actions[bot],renovate[bot]"
+          remote-organization-name: "blacklanternsecurity"
+          remote-repository-name: "CLA"