v4: feat(deploy): expandEnv + conditional pause + folder change (#1)

Add the ability to specify additional custom HTTP headers

Switch to Go modules

Add support for basic auth username and password (ricardo-ch#36)

minors fixes: (ricardo-ch#35)

- comment that new accepted parameter are path to files
- generate mocks
- remove unused stanza in config.toml

fix few bugs for multiple deployment (ricardo-ch#33)

Deploy multiple (ricardo-ch#32)

Deploy multiple (ricardo-ch#32)

Some random fixes on REST client (ricardo-ch#31)

- rm useless setRestMode
- rm fall back to string error parser because to complicated
- define expected status code where error is definitive for each calls
- actually return an error when such such situation occurs
- retry all 409

clean up cli and add doc (ricardo-ch#24)