Verify only one file is present

Author: cx-aniket-shinde

.github/workflows/ci.yml

@@ -25,6 +25,11 @@ jobs:
             exit 1
           fi
 
+          if [ ! -f yarn.lock ] && [ ! -f package-lock.json ]; then
+            echo "ERROR: No lockfile found,Policy requires exactly ONE package manager lockfile"
+            exit 1
+          fi
+
       - name: Use Node.js 22.11.0
         uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:

.github/workflows/release.yml

@@ -85,6 +85,11 @@ jobs:
             exit 1
           fi
 
+          if [ ! -f yarn.lock ] && [ ! -f package-lock.json ]; then
+            echo "ERROR: No lockfile found,Policy requires exactly ONE package manager lockfile"
+            exit 1
+          fi
+
       # GIT CONFIGURATION
       - run: |
           git config user.name github-actions