feat: support host_aliases

[ysicing]

Signed-off-by: ysicing [email protected]

support pipeline hosts

host_aliases:
  - ip: 1.1.1.1.1
    hostnames: 
      - www.baidu.com

[CLAassistant]

All committers have signed the CLA.

[tphoney]

is #52 comparable to this ?

[ysicing]

@tphoney No, this supports the definition of HostAliases in pipeline

[tphoney]

Hey @ysicing reviewing this again. The code looks good and we can merge it.
But can you give an example of how you would use the new variable, then i can add docs for it here https://docs.drone.io/runner/docker/configuration/reference/
or if you want to create the documentation for the feature, i can merge it.

[ysicing]

@tphoney Hey, the document has been updated. docs#537

[tphoney]

Docs merged and PR merged.
Great work @ysicing i owe you a 🍺