Use git reset rather than git checkout for spack-packages update (

#166)

* deploy-2-start.yml: Use `git reset` rather than `git checkout` to ensure we have remotes copy of history

* deploy-2-start.yml: Checkout the branch before force-resetting

.github/workflows/deploy-2-start.yml

@@ -102,6 +102,7 @@ jobs:
           # Update spack-packages
           git -C ${{ steps.path.outputs.spack-packages }} fetch
           git -C ${{ steps.path.outputs.spack-packages }} checkout --force ${{ steps.versions.outputs.packages }}
+          git -C ${{ steps.path.outputs.spack-packages }} reset --hard origin/${{ steps.versions.outputs.packages }}
 
           # Enable spack
           . ${{ steps.path.outputs.spack-config }}/spack-enable.bash