Accept k8s version to build node images

[kishen-v]

Changes:

1. Accept version of k8s as an input to the workflow to build kind-node images.
2. Refer to vars.QUAY_USERNAME from the earlier secrets.QUAY_USERNAME (requires changes in the repository setting to have this variable defined)

The docker workflow tends to fail as k8s-version is defaulting to null rather than master. However, subsequent builds seem to run fine.

##[debug]Evaluating: format('Build kind-node image - {0}', inputs.k8s-version)
[50](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:54)
##[debug]Evaluating format:
[51](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:55)
##[debug]..Evaluating String:
[52](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:56)
##[debug]..=> 'Build kind-node image - {0}'
[53](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:57)
##[debug]..Evaluating Index:
[54](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:58)
##[debug]....Evaluating inputs:
[55](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:59)
##[debug]....=> Object
[56](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:60)
##[debug]....Evaluating String:
[57](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:61)
##[debug]....=> 'k8s-version'
[58](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:62)
##[debug]..=> null.   <--------------------
[59](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:63)
##[debug]=> 'Build kind-node image - '
[60](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:64)
##[debug]Result: 'Build kind-node image - '
[61](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:65)
##[debug]Set step '__run_3' display name to: 'Build kind-node image - '
[62](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:66)
##[debug]Set step '__run_4' display name to: 'Publish node image'
[63](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:67)
Complete job name: build
[64](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:68)
##[debug]Collect running processes for tracking orphan processes.
[65](https://github.com/kishen-v/kind-image/actions/runs/9937700804/job/27450385411#step:1:69)
##[debug]Finishing: Set up job

vs.

##[debug]Evaluating format:
[51](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:55)
##[debug]..Evaluating String:
[52](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:56)
##[debug]..=> 'Build kind-node image - {0}'
[53](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:57)
##[debug]..Evaluating Index:
[54](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:58)
##[debug]....Evaluating inputs:
[55](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:59)
##[debug]....=> Object
[56](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:60)
##[debug]....Evaluating String:
[57](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:61)
##[debug]....=> 'k8s-version'
[58](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:62)
##[debug]..=> 'master' <------------
[59](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:63)
##[debug]=> 'Build kind-node image - master'
[60](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:64)
##[debug]Result: 'Build kind-node image - master'
[61](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:65)
##[debug]Set step '__run_3' display name to: 'Build kind-node image - master'
[62](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:66)
##[debug]Set step '__run_4' display name to: 'Publish node image'
[63](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:67)
Complete job name: build
[64](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:68)
##[debug]Collect running processes for tracking orphan processes.
[65](https://github.com/kishen-v/kind-image/actions/runs/9938312957/job/27450516466#step:1:69)
##[debug]Finishing: Set up job

[mkumatag]

@kishen-v I made as an admin to this repo, you can add the required variables in the settings section and also build is failing in the CI, please check..

[mkumatag]

hope this PR is ready for the merge!

[mkumatag]

/lgtm

[ppc64le-cloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishen-v, mkumatag

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