Check content of github.head_ref

Author: iluuu1994

.github/workflows/push.yml

@@ -36,6 +36,8 @@ jobs:
     name: "LINUX_X64_${{ matrix.debug && 'DEBUG' || 'RELEASE' }}_${{ matrix.zts && 'ZTS' || 'NTS' }}"
     runs-on: ubuntu-20.04
     steps:
+      - name: Print github.head_ref
+        run: echo "${{ github.head_ref }}"
       - name: git checkout
         uses: actions/checkout@v3
       - name: Create MSSQL container