set github SHA (#60)

Author: perazz

.github/workflows/tests.yml

@@ -55,6 +55,7 @@ jobs:
         if: github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch'
         env:
           HOMEBREW_ARCH: ${{ matrix.arch }}
+          GITHUB_SHA: ${{ github.event.inputs.head_sha || github.sha }}
 
       - name: Upload bottles as artifact
         if: always() && (github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch')