Can't locate `sh` on Windows runner

[Krzmbrzl]

Used image: windows-2025-vs2026

See https://github.com/mumble-voip/mumble/actions/runs/22540545825/job/65295041730

Fails with:

Saving cache failed: Error: Unable to locate executable file: sh. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also verify the file has a valid extension for an executable file.

My guess is that this image doesn't have an alias for sh

My guess is that this is the failing line:

ccache-action/src/save.ts

Line 38 in a846541

return exec.getExecOutput("sh", ["-xc", cmd], {silent: true});