# Description of Changes
Our `Dockerfile` runs `COPY . .`. If we're in a submodule rather than a
"full" git repo, that causes `.git` to be a in a weird state inside the
docker container, where it thinks it's in a submodule even though the
parent directory context has been lost.
This PR just adds a clear error message early in the process, because
this has bitten us a few times.
# API and ABI breaking changes
None
# Expected complexity level and risk
1
# Testing
- [x] We appropriately get the failure if we try to `docker build` this
from within a submodule.
Co-authored-by: Zeke Foppa <bfops@users.noreply.github.com>
Zeke Foppa