- GitHub Actions Ubuntu: Case sensitive
- My local macOS PC: Case insensitive
The case-sensitivity between the GitHub Actions runner and your local environment is sometimes different
mdBook can recognize
SUMMARY.md but cannot
summary.md on a GitHub Actions runner (Ubuntu VM).
On the other hand, both
summary.md are acceptable on my local macOS machine.
The case-sensitivity between the GitHub Actions runner and my local environment was different.
My local macOS machine has been formatted with case-insensitive mode, so the local building has passed and the remote building failed.
We can’t offer another image at this time since it would affect overall capacity of Mac and be costly to maintain.