Update documentation for registry-operator release process

[Jdubrick]

Which area/kind this issue is related to?

/area registry /area documentation

Issue Description

After completion of https://github.com/devfile/api/issues/1326 we will need to update the registry-operator release documentation to include usage instructions. The document outlining the current process that needs to be updated can be found here.

The following changes should be made to the documentation after the completion of https://github.com/devfile/api/issues/1326 as it is currently waiting on changes to the prior release.

Acceptance Criteria

The release process changes will be made here.

• [ ] Add instructions for ensuring yq is installed
• [ ] Add instructions for exporting GITHUB_TOKEN (see below)
• [ ] Add instructions for running the script with make release NEW_VERSION=x.x.x (see README)
• [ ] Add instructions for filling out the PR description as the automation cannot write a description. You will need to outline where to find the template and how to fill out the template for a release.
• [ ] Add instructions telling those who are performing the release to avoid using squash functionalities, the entire git history is necessary for the script to run properly.

GITHUB_TOKEN

This script requires the export of an environment variable named GITHUB_TOKEN. This token is a PAT created from your GitHub account here. The token will require repo access.

[Jdubrick]

Adding blocked label as this should wait until final completion of https://github.com/devfile/registry-operator/pull/75

[github-actions[bot]]

This issue is stale because it has been open for 90 days with no activity. Remove stale label or comment or this will be closed in 60 days.