feature request: `gin commit --lock`

To add a new file to a repository in a locked state currently 3 steps are required as files can only be locked after being committed

- `gin commit `
- `gin lock `
- `gin commit `

This is inconvenient and created unnecessary commits. From the git-annex perspective it is possible (and the default behaviour) that files are locked when added to the staging area. This way only a single commit would be required to commit a file in a locked state. Would it be possible to add a `--lock` flag to `gin commit`that automatically locks the committed files to simplify this procedure?