ci(quay): set up CI action

[andrewazores]

Welcome to Cryostat! 👋

Before contributing, make sure you have:

• Read the contributing guidelines
• Linked a relevant issue which this PR resolves
• Linked any other relevant issues, PR's, or documentation, if any
• Resolved all conflicts, if any
• Rebased your branch PR on top of the latest upstream main branch
• Attached at least one of the following labels to the PR: [chore, ci, docs, feat, fix, test]
• Signed all commits using a GPG signature

To recreate commits with GPG signature git fetch upstream && git rebase --force --gpg-sign upstream/main

---

Fixes: #1

Description of the change:

Builds and pushes the testing applications from this repo to the quay.io/redhat-java-monitoring registry so that there are up-to-date builds which we can easily upgrade for newer base images, dependencies, Agent versions, etc.

Test run:
https://github.com/andrewazores/test-applications/actions/runs/9878251166/job/27281813882

Results:

• https://quay.io/repository/andrewazores/vertx-cryostat-agent?tab=tags
• https://quay.io/repository/andrewazores/quarkus-cryostat-agent?tab=tags
• https://quay.io/repository/andrewazores/gameserver-cryostat-agent?tab=tags

[andrewazores]

Newer test run: https://github.com/andrewazores/test-applications/actions/runs/9879950283