"nothing to commit, working tree clean Error: Invalid status code: 1" despite `skip_dirty_check`

Reproduce the issue using .github/workflows/tag-version.yml and the tag-version-this-repo.yml workflow, then inspect index.js around the ChildProcess status handling shown in the stack trace. Compare the v7.0.0 behavior with v6.0.1 and issue 204; done means an empty merge followed by skip_dirty_check succeeds without the invalid status code error.

git-auto-commit Version

v7.0.0

Machine Type

Ubuntu (eg. ubuntu-latest)

Bug description

Despite skip_dirty_check: true, with v7.0.0 pushing an empty commit causes the following error:

nothing to commit, working tree clean
Error: Invalid status code: 1
    at ChildProcess.<anonymous> (/home/runner/work/_actions/stefanzweifel/git-auto-commit-action/28e16e81777b558cc906c8750092100bbb34c5e3/index.js:17:19)
    at ChildProcess.emit (node:events:508:28)
    at maybeClose (node:internal/child_process:1101:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5) {
  code: 1
}
Error: Invalid status code: 1
    at ChildProcess.<anonymous> (/home/runner/work/_actions/stefanzweifel/git-auto-commit-action/28e16e81777b558cc906c8750092100bbb34c5e3/index.js:17:19)
    at ChildProcess.emit (node:events:508:28)
    at maybeClose (node:internal/child_process:1101:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5)

This is a regression with v7.0.0. With v6.0.1 this used to work. Here's a succeeding run with v6: https://github.com/Lombiq/GitHub-Actions/actions/runs/17049708039. And here's a failing one with v7: https://github.com/Lombiq/GitHub-Actions/actions/runs/18795730636/job/53635182329.

https://github.com/stefanzweifel/git-auto-commit-action/issues/204 might be related.

Steps to reproduce

1. In your workflow, run git merge --strategy=ours --no-commit some-other-branch. This merges some-other-branch but leaving no changed files.
2. Run the action with the below code.
3. Observe the error mentioned above.

- uses: stefanzweifel/git-auto-commit-action@28e16e81777b558cc906c8750092100bbb34c5e3 # v7.0.0
  with:
    skip_dirty_check: true

Tried solutions

Since this is an infrequently run workflow, I just merged manually. Pushing directly with git would be an alternative.

Example Workflow

The whole workflow is here: https://github.com/Lombiq/GitHub-Actions/blob/342f3f003b75f8915c8c8311f67426971e798a52/.github/workflows/tag-version.yml (run from https://github.com/Lombiq/GitHub-Actions/blob/342f3f003b75f8915c8c8311f67426971e798a52/.github/workflows/tag-version-this-repo.yml).

Relevant log output

See above.

Repository

https://github.com/Lombiq/GitHub-Actions