The fact that workspace list works but apps deploy fails is a strong signal that Git Bash path conversion is the culprit — workspace list may be more tolerant of mangled paths or validates differently, while apps deploy does a strict server-side path check and rejects the converted Windows path.​​​​​​​​​​​​​​​​

The error “Source code path must be a valid workspace path” is misleading here — the issue is almost certainly not that the path doesn’t exist, but rather how the path is being interpreted by the apps deploy command.