Update scan_vulnerabilies.yml

Author: jsvd

.github/workflows/scan_vulnerabilies.yml

@@ -13,6 +13,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
+          ref: ${{ github.head_ref }}
       - run: ./gradlew clean assembleTarDistribution
       - run: ls -lha
       - run: mkdir scan