Run all CI commands inside the build container

[tdmanv]

Change Overview

• Performance improvements
  • Use simple travis VM since all commands are containerized
  • Use https://docs.travis-ci.com/user/caching/
    • go mod source files
    • go build cache
  • Parallel jobs for docs and go tests
  • Add binaries to build image
    • kind, docker, jq
• travis config simplificiations
  • uses start/stop-kind instead of directly invoking local_kube.sh
• Makefile updates
  • Use tabs consistently
  • add go-mod-download
  • add release-snapshot

Pull request type

Please check the type of change your PR introduces:

• Work in Progress
• Refactoring (no functional changes, no api changes)
• Trival/Minor
• Bugfix
• Feature
• Documentation

[vkamra]

This looks like a local testing change

[tdmanv]

it is indeed - though we do need to change this to kanisterio/controller

[tdmanv]

This should shave 1:30 off the CI time:

fetching PR.209/cache-linux-trusty-ba046e48339afca65649ce5a9c8e3f5d41c611db015d9d7f89f9e5899e4bb612--go-1.12.x.tgz
found cache
0.00s6.03sadding /home/travis/gopath/src/github.com/kanisterio/kanister/.go/pkg/mod to cache
creating directory /home/travis/gopath/src/github.com/kanisterio/kanister/.go/pkg/mod

[tdmanv]

Shaved 6 minutes off CI

[depohmel]

are we renaming the controller image?

[depohmel]

because then we have to change

kanister/helm/kanister-operator/values.yaml

Line 5 in 0041a02

repository: kanisterio/controller

and ALL other references

[tdmanv]

There's a mismatch in the goreleaser file. I'll change that instead of this.