Add .netrc support for remote http(s) paths

[sylr]

I've made this patch to get Basic Auth from the .netrc file like curl or wget allow you to.

This allows avoiding private registry credentials stored in the kustomize manifests.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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PR needs rebase.

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[annasong20]

Hi @sylr, thank you for taking the time to submit this PR.

Authenticating to remote sources is a useful feature we may be open to considering. However, in the same vein as my comment on reading environment variables for authentication, introducing build-time side effects to kustomize is a big deal and we should discuss it in a kubernetes KEP first.

/hold

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/lifecycle stale

[sylr]

/remove-lifecycle stale

[k8s-triage-robot]

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

This bot triages PRs 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 PR is closed

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• Mark this PR as fresh with /remove-lifecycle stale
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• Offer to help out with Issue Triage

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

/lifecycle stale

[sylr]

/remove-lifecycle stale