Allows using a local image in make create-cluster

[sayantani11]

What type of PR is this?

What this PR does / why we need it:
Allows using a local image in make create-cluster to avoid having to push the dev image out to a registry

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 #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

Local image usage for `make create-cluster`

[k8s-ci-robot]

Hi @sayantani11. Thanks for your PR.

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[k8s-ci-robot]

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[dims]

/ok-to-test

[sayantani11]

@cpanato I tried using GPG key, but I am kind of unsure about it. If possible can I replace it with SSH Key? Or should we remove this part?

[cpanato]

thanks for this

but what is the difference between using this and using the tilt config we have? seems similar

[sayantani11]

thanks for this

but what is the difference between using this and using the tilt config we have? seems similar

Its makes it convenient so we could use a local image, else we would require to push the dev image to a registry first. Just to make the experience better. Like done in capz, trying to bring capg on the same page: kubernetes-sigs/cluster-api-provider-azure#471

[sayantani11]

/retest
We will be needing this for the developer-doc