Attempt to address #11705 and #11028.
The docker container runs gitea by default: 1d12151086/docker/root/etc/s6/gitea/run
Whereas a user might run `forgejo doctor ...` (which is symlinked to gitea).
So the doctor expects a different value for the authorized_keys command.
This fix does the opposite of syncAppConfForGit: it fetches the `AppPath` from the database to ensure it is the same as forgejo:
1d12151086/routers/init.go (L76-L87)
### Testing
1. Make a symlink called `forgejo`, pointing to gitea `ln -s gitea forgejo`
2. Run `./gitea` and add a ssh key to a user
3. Stop `./gitea`
4. Run `./forgejo doctor check --run authorized-keys`
Without this fix, the last command should fail.
With the fix, the last command should succeed and print:
```
- [I] AppPath changed from '/home/forgejo/forgejo' to '/home/forgejo/gitea'
```
- I ran...
- [x] `make pr-go` before pushing
### Documentation
- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [x] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
- [ ] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.
*The decision if the pull request will be shown in the release notes is up to the mergers / release team.*
The content of the `release-notes/<pull request number>.md` file will serve as the basis for the release notes. If the file does not exist, the title of the pull request will be used instead.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12901
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
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