HTTP/HTTPs Proxy for kaniko pod while running in isolated environment

[prary]

Expected behavior

Run skaffold in lab environment where access to internet is via proxy and use kaniko as image builder. Now skaffold spins up kaniko pod which doesn't have proxy set which results in base image pull failure, hence both kaniko and skaffold fails

Actual behavior

skaffold should run seamless irrespective of environment.

Possible Solution

Kaniko config should have http_proxy and https_proxy field and they should be passed as the environment variable to the kaniko pod.

Containers: []v1.Container{
                {
                    Name:            constants.DefaultKanikoContainerName,
                    Image:           image,
                    Args:            args,
                    ImagePullPolicy: v1.PullIfNotPresent,
                    Env: []v1.EnvVar{
                        {
                        Name:  "GOOGLE_APPLICATION_CREDENTIALS",
                        Value: "/secret/kaniko-secret",
                        }
                        {
                        Name:  "http_proxy",
                        Value: "somevalue",
                        }
                        {
                        Name:  "https_proxy",
                        Value: "somevalue",
                        }
                    },
                },

Information

• Skaffold version: latest
• Operating system: rhel
• Contents of skaffold.yaml:

apiVersion: skaffold/
kind: Config
build:
  artifacts:
# denotes the user’s image push location in artifactory, ensure user write permission in artifactory, this should be the same location referenced in your respective deployment yml
  - image: www.a.com/kube/pythonserver
    context: .
    sync:
      '*.py': .
  kaniko:
    buildContext:
      localDir: {}
    namespace: 103000-prash-dev
    podGracePeriodSeconds: 10
    dockerConfig:
      path: C:\Users\prashant\.docker\config.json
deploy:
  kubectl:
    manifests:
#must match the kubernetes deploy file name of application
      - deploy.yml

Steps to reproduce the behavior

1. Run skaffold in lab environment where access to internet is via proxy
2. Skaffold fails at kaniko image building phase

[priyawadhwa]

Design doc here: #2064

[prary]

closing the issue since #2283 does the job.