Simplify commit SHA checkout to avoid git fetch issues

- Use full history fetch for all runs to ensure commit availability
- Remove problematic git fetch command that treated SHA as ref
- Directly checkout commit SHA after full clone
- Prioritize reliability over shallow clone optimization

This should resolve the "couldn't find remote ref" error when testing
specific commits via workflow_dispatch.

Signed-off-by: [email protected]

Author: markpollack

.github/workflows/main-push-fast.yml

@@ -29,12 +29,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with: 
-          fetch-depth: ${{ github.event.inputs.commit_sha && 0 || 2 }}
+          fetch-depth: 0  # Always use full history for manual runs to find any commit
 
       - name: Checkout specific commit
         if: github.event.inputs.commit_sha
         run: |
-          git fetch origin ${{ github.event.inputs.commit_sha }}
+          echo "Checking out specific commit: ${{ github.event.inputs.commit_sha }}"
           git checkout ${{ github.event.inputs.commit_sha }}
 
       - uses: actions/setup-java@v4