Occasional git submodule errors on jobs

Teo Camarasu
2026-01-21T15:12:20Z

We occasionally see errors like this one on jobs:
```
Synchronizing submodule url for 'tests/text'
fatal: Unable to find current revision in submodule path 'tests/text'
```
I feel like maybe there's some corruption in a cache somewhere?

Examples:
- https://gitlab.haskell.org/ghc/head.hackage/-/jobs/2101075
- https://gitlab.haskell.org/ghc/head.hackage/-/jobs/2103159