Testing olm

[DanielePalaia]

Similar to rabbitmq/cluster-operator#1569.

This PR is part of the task to migrate our Concourse pipelines to github actions:

It is migrating the OLM pipeline in order to test our OLM bundle in the messaging-topology-operator:
https://github.com/pivotal/rabbitmq-for-kubernetes-ci/blob/main/pipelines/olm-bundles/pipeline.yml

it can be useful to have a look to this guideline in order to see how to create and publish an OLM bundle:
https://devopstales.github.io/home/oml/

The test images are stored in the environment variable specified in:
DOCKER_REGISTRY_SERVER: quay.io/rabbitmqoperator
OLM_IMAGE: rabbitmq-for-kubernetes-olm-messaging-topology-operator
OLM_INDEX_IMAGE: rabbitmq-for-kubernetes-olm-messaging-topology-operator-index

[Zerpet]

I guess you are still working on this PR 🚧 A suggestion, can we use the Checkout Action instead of git clone?

It's a bit hard to understand and read through the "create" task with all the setup intertwined with the actual commands to generate the bundle.

[Zerpet]

This hasn't updated in a long time, but perhaps it still creates the bundle that we can use?

https://github.com/marketplace/actions/olm-bundle

[DanielePalaia]

@Zerpet yes it is nicer to use checkout, I will fix it.

About this https://github.com/marketplace/actions/olm-bundle it is quite interesting.
I spent some time trying to find a script to do this conversion before implementing the simple script in: https://github.com/rabbitmq/OLM-Package-Repo
but I wasn't able to find anything except the script that operatorhub has in its own UI (without any reusable code).
I didn't think to search for a github-action.

If the action is working we can use directly that one avoiding to refactor and maintaining that script which is good.
Anyway this will take more testing. At this point I would prefer to do this testing eventually in a new iteration/PR as part of the issue we have to review this OLM part in general and in the meantime go ahead with this PR as I already integrated rabbitmq/OLM-Package-Repo#8 which may make the old publishing PR not working anymore

[DanielePalaia]

I replaced the git clones with the better checkout actions and I have tested it. I will now merge this one to test it on the next release. We can come back here when we will improve the OLM packaging script.