Implement PRs CI checks that run on an OpenShift cluster

[fabiobrz]

Intersmash should be able to test itself.
This issue specifically tracks the implementation of a mechanism that should run the integration tests on an OpenShift cluster.

The preferred solution would be to evaluate a solution based on the https://docs.ci.openshift.org/docs/ infrastructure.

The CI checks should at least be triggered when submitting a PR or pushing changes to it, while the implementation of a a comment based trigger (e.g.: /test) would be nice to have.

Alternatives

• There's a chance to use a Red Hat OCP developer sandbox, see https://developers.redhat.com/developer-sandbox which could serve this issue purpose with a couple of limitations, i.e. it would expire after some time (but a new one can be ready in a few minutes) and would not be such good when it comes to load, but at the moment we're not in a situation where a concerning load is expected.

• Instead, on a bright side, the sandbox is easily usable through GitHub actions, see e.g. https://redhat-scholars.github.io/openshift-starter-guides/rhs-openshift-starter-guides/4.7/nationalparks-java-codechanges-github-actions.html and would allow for this issue to be solved quickly, since things need to be done, while a more advanced and suitable solution will be explored.

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• Environment: GitHub + OpenShift
• Steps to reproduce: N/A

[fabiobrz]

WIP in:

• New repo - Intersmash/intersmash openshift/release#37965
  Depends on https://github.com/Intersmash/intersmash/tree/openshift-ci.exp
  When the latter is merged, the OpenShift CI automation will have to be reviewed to depend on the main branch.

[fabiobrz]

Reopening since was automatically closed. Will be closed once openshift/release#37965 is merged.