Add GitHub Action for updating license file for dependabot branches (#…

…1517)

https://ucsc-cgl.atlassian.net/browse/SEAB-4223

.github/workflows/update_license.yml

@@ -0,0 +1,33 @@
+name: Update license file
+
+on:
+  push:
+    branches:
+      - 'dependabot/**'
+
+jobs:
+  update_license_file:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Install git-secrets 
+        run: npm run install-git-secrets
+
+      - name: Update license file
+        run: npm run license
+
+      - name: Push changes if license file changed
+        run: |
+          if [ -n "$(git status --porcelain | grep "THIRD-PARTY-LICENSES.csv")" ]; then
+            git config user.name "github-actions[bot]"
+            git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+            git add THIRD-PARTY-LICENSES.csv
+            git commit -m "Update license file"
+            git push
+          else
+            echo "There were no changes to THIRD-PARTY-LICENSE.csv"
+          fi