📖Add GitHub PAT doc

[aniruddha2000]

Signed-off-by: Aniruddha Basak [email protected]

What this PR does / why we need it:
It's a doc PR that adds information about GitHub Personal Access Token to avoid rate limiting.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #7188

[aniruddha2000]

/cc @ykakarap @fabriziopandini

[k8s-ci-robot]

Hi @aniruddha2000. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[oscr]

This section mentions scope and how to export the token. Maybe of value here?

cluster-api/docs/developer/releasing.md

Lines 19 to 21 in fd11302

	1. If you don't have a GitHub token, create one by going to your GitHub settings, in [Personal access tokens](https://github.com/settings/tokens). Make sure you give the token the `repo` scope.
	1. Wait for the above job to complete for the tag commit and for the image to exist in the staging repository, then create a PR to promote the image and tag:
	- `export GITHUB_TOKEN=<your GH token>`

Overall great. Minor changes and I think this will be a great addition.

[ykakarap]

Looms good overall. Just a couple of suggeestions.

Can you also please link this section in the clusterctl init page and the clusterctl configuration page as requested here

[killianmuldoon]

/ok-to-test

[fabriziopandini]

one small nits, otherwise lgtm

[oscr]

A small advice for future prs: don't forget to resolve comments after you've completed them. Otherwise great work!

/lgtm

[aniruddha2000]

@oscr I will keep that in mind :)

[fabriziopandini]

/lgtm
/approve

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@fabriziopandini: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/lgtm
/approve

/cherry-pick release-1.2

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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• OWNERS [fabriziopandini]

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[k8s-infra-cherrypick-robot]

@fabriziopandini: new pull request created: #7265

In response to this:

/lgtm
/approve

/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.