Add Environment Variable For SRC_BASE And SRC_HOST

[midnightconman]

We have REPO_NAME and REPO_OWNER, but we don't have SRC_BASE (GOPATH+/src) and SRC_HOST (which is normally github.com, but it can be different for github enterprise). This would allow building extra_ref paths instead of using relative paths for executables.

[petr-muller]

/kind feature

[k8s-triage-robot]

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle rotten
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle rotten