.github: avoid full checkout on backport

The backport action should work with a sparse tree, so materializing all files is just wasteful. Since total time allocated for backport jobs is just 3 mins, sometimes a slow worktree checkout consumes a good chunk of it and pushes the job to timeout, resulting in missed backport. See for example: https://github.com/NixOS/nixpkgs/actions/runs/30587897004/job/91023481883
2026-07-30 20:03:42 -04:00
parent 46fca1bb80
commit 830255b283
1 changed files with 2 additions and 0 deletions
@@ -39,6 +39,8 @@ jobs:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
        with:
          ref: ${{ github.event.pull_request.head.sha }}
+          # Avoid materializing full nixpkgs tree
+          sparse-checkout: .
          token: ${{ steps.app-token.outputs.token }}
          persist-credentials: true