echo github ref to debug

Author: andy-fastly

.github/workflows/build.yml

@@ -15,6 +15,7 @@ jobs:
         go: [ '1.14' ]
     name: Build ${{ matrix.go }}
     steps:
+    - run: echo '${{ github.ref }}'
     - uses: aws-actions/configure-aws-credentials@v1
       with:
         aws-access-key-id: ${{ secrets.SIGSCI_PROD_ACCESS_KEY_ID }}