create seperate github action workflow for pull requests

[itewk]

purpose

currently the same github action workflow is used for publishing and pull requests.

history

This was done to "make life easy" for images that are dependent on eachother so they can pull their dependent image from quay even for a PR.

issues

• all pull requests have to be from branches on this repo since they require secrets that allow the publish to publish to quay.io

fix

create a new github workflow for pull reuquests that only uses local images (possibly having to pass them to/from depdent jobs) and doesn't do any publishing to quay.io thus allowing pull requests from forked repositories