Add git tag script to release announcement

[rcrozean]

Issue #, if available:

Description of changes:
This is connected to https://github.com/aws/eks-distro/pull/2979/files. It will run a tag the commit as the release after the announcements run.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[bhavi-koduru]

/lgtm

[rcrozean]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rcrozean

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[rcrozean]

/retest

[eks-distro-bot]

@rcrozean: Updated the job-config configmap in namespace default at cluster default using the following files:

• key announcement-postsubmits.yaml using file jobs/aws/eks-distro/announcement-postsubmits.yaml

In response to this:

Issue #, if available:

Description of changes:
This is connected to https://github.com/aws/eks-distro/pull/2979/files. It will run a tag the commit as the release after the announcements run.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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.