Feature: Support regex in profile activation via kubeContext

[dkirrane]

It would be good to auto-activate a Skaffold profile based on a kubeContext regex.

e.g. My clusters (both gke & on-prem) have names like the following:

• gke_my-team_europe-west2-a_my-dev-cluster
• gke_my-team_europe-west2-a_my-sanity-cluster
• kubernetes-admin@dev
• kubernetes-admin@sanity

I want to run the gke profile below when my kube context matches a GKE cluster name (using regex gke.*)

apiVersion: skaffold/v1beta5
kind: Config
.
.
.
profiles:
  - name: gke
    build:
      artifacts:
        - image: eu.gcr.io/my-team/my-app
          jibMaven: {}
    activation:
      - kubeContext: "gke.*"

[charlyx]

kubeContext actually supports "equals" AND "not equals" by prefixing with !.
Shall we add a kubeContextRegexp so we don't mix things with current behaviour?

[dgageot]

Fixed with #2065