Add command to update the runner in action.yml files

[SeanTAllen]

The best way to run a released GitHub action is to use a prebuilt docker
image. This saves time with building the image and guarantees that each
run will be using exactly the same action code.

This is best accomplished by settings runs.image to the image in question
in action.yml.

However, this does have a drawback of not being able to use arbitrary commits
to run with as that commit will be grabbed BUT... the image in its action.yml
will be used. This is problematic for testing actions.

The two commands included in this commit address both issues.

• update-action-to-use-docker-image-to-run-action.py

Updates runs.image to a docker image with the version we are releasing.
As part of the release process for an action, it should then also make
sure to push a prebuilt image to DockerHub for the action in question.

This command should be run in the pre-tagging job.

• update-action-to-use-dockerfile-to-run-action.py

Switches back to using Dockerfile for how to run the action.

This command should be run in the post-tagging job.

[ponylang-main]

Hi @SeanTAllen,

The changelog - added label was added to this pull request; all PRs with a changelog label need to have release notes included as part of the PR. If you haven't added release notes already, please do.

Release notes are added by creating a uniquely named file in the .release-notes directory. We suggest you call the file 38.md to match the number of this pull request.

The basic format of the release notes (using markdown) should be:

## Title

End user description of changes, why it's important,
problems it solves etc.

If a breaking change, make sure to include 1 or more
examples what code would look like prior to this change
and how to update it to work after this change.

Thanks.