Add `pass` credential store support on Linux

[gesellix]

See

https://github.com/docker/cli/blob/1401d5daf2f49a97791487dd5c5a8598907f0bf1/cli/config/credentials/default_store_linux.go

• https://github.com/docker/docker-credential-helpers/tree/d68f9aeca33f5fd3f08eeae5e9d175edf4e731d1/pass