How to use shell in ConEmu console for windows 10 when I enabled shell in developer mode?

I enabled the shell with this tutorial https://www.windowscentral.com/how-install-bash-shell-command-line-windows-10

But if I have a shell script named ca.sh in a project root directory, I still can't run inside the project root with http://superuser.com/ca.sh and error out with

'.' is not recognized as an internal or external command

Anything I can do to enable shell mode inside ConEmu?

http://superuser.com/ca.sh content:

#!/bin/shecho "Commit all with message: $1"git statusgit add *git commit -m "chore(): $1"git push origin master

I originally wrote something similar on MacOS and it runs well.