Builder is failing when using just local builder

[cleanbit]

mrsk always failing if builder has just one local architecture. The issue was introduced with v0.14.0, downgrading to v0.13.2 helps.

Identical ticket was opened and closed instantly for some reason :)

I'm running M1 and cross-compiling to amd64

Error:

ERROR (ArgumentError): You must specify both local and remote builder config for remote multiarch builds

builder part of the config.

builder:
  local:
    arch: amd64

[scart88]

Hey @cleanbit, I switched to remote option as it was much faster to build the image than on my M1.
In addition to that, the server network speed is up to 1gb and was much faster to upload to the registry.

[djmb]

I think this regression was introduced in #337 - cc @igor-alexandrov.

[igor-alexandrov]

Yes, it is my fault. Will prepare a fix ASAP.

[igor-alexandrov]

@djmb I opened a PR.

However I understood two things:

1. Currently we support cache for only native builds (this is what I initially needed), remote cached builds are not supported. Should cache also be implemented for remote builds?
2. We should really put some effort to finalize this: Validate deploy.yaml with json-schema #37