Fix the bug on try.gitea.io
```log
2023/09/18 01:48:41 ...ations/migrations.go:635:Migrate() [I] Migration[276]: Add RemoteAddress to mirrors
2023/09/18 01:48:41 routers/common/db.go:34:InitDBEngine() [E] ORM engine initialization attempt #7/10 failed. Error: migrate: migration[276]: Add RemoteAddress to mirrors failed: exit status 128 - fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
- fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
```
Caused by #26952
---------
Co-authored-by: Jason Song <i@wolfogre.com>
e644cc9448