feat(macOS): Support Lima

[rudeigerc]

Description

envd would use the default context even if the default context of docker was changed.

Reproduction

# default context is `lima`
$ docker context list
NAME                TYPE                DESCRIPTION                               DOCKER ENDPOINT                                         KUBERNETES ENDPOINT                 ORCHESTRATOR
default             moby                Current DOCKER_HOST based configuration   unix:///var/run/docker.sock                             https://127.0.0.1:49413 (default)   swarm
desktop-linux       moby                                                          unix:///Users/rudeigerc/.docker/run/docker.sock                                             
lima *              moby                                                          unix:///Users/rudeigerc/.lima/docker/sock/docker.sock

# docker works well with `lima`
$ docker images 
REPOSITORY         TAG       IMAGE ID       CREATED         SIZE
envd-quick-start   dev       5429274991ac   5 minutes ago   757MB
moby/buildkit      v0.10.3   a2c9241854f2   5 weeks ago     142MB

# envd uses `default`
$ envd get envs
error: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Additional Info

envd: v0.1.0-alpha.12+8531491
  BuildDate: 2022-06-17T01:20:35Z
  GitCommit: 853149189d88e6ecf6a5a924e3aa19d8f7993f7e
  GitTreeState: clean
  GoVersion: go1.18.3
  Compiler: gc
  Platform: darwin/amd64

[gaocegege]

Thanks for the issue! I will have a look ASAP.

[gaocegege]

We use docker client golang package to communicate with the Docker daemon. I am not sure if the package supports context.

[gaocegege]

The context info is stored in ~/.docker/config.json:

{
	"auths": {...
	},
	"currentContext": "docker-test"
}

We cannot get it without reading the file.

[gaocegege]

I think we should support #92 instead.