specify git commit and repo url for melange github action (#4961)

.github/actions/build-custom-melange-package/action.yml

@@ -56,6 +56,8 @@ runs:
       with:
         config: ${{ inputs.context }}/melange.yaml
         archs: ${{ inputs.arch }}
+        git-commit: ${{ github.sha }}
+        git-repo-url: ${{ github.server_url }}/${{ github.repository }}
         sign-with-temporary-key: true
 
     # upload artifacts generated by the melange build so they can later be used by apko