New repo: lage doesn't work

[dzearing]

Describe the bug

Scaffold a new repo, run lage build, throws rust exception:

D:\git\pgo-bundling-tools>yarn build
lage - Version 2.7.13 - 15 Workers
thread '<unnamed>' panicked at 'Failed to read file: Failed to read file', src\hasher.rs:87:48
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

To Reproduce

Steps to reproduce the behavior:

1. Create new git repo, clone
2. Set up some packages
3. run yarn in the workspace to link them
4. Run yarn lage build from root

Expected behavior

Builds successfully.

Environment/Troubleshooting

Once I merged, this problem went away. This only happens if we haven't yet merged changes to the new repo.