ci(db): clean up database container after test run

[andrewazores]

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---

Fixes: #221

Description of the change:

Update configuration to allow ryuk container to run, which is responsible for cleaning up leftover containers (like cryostat-db or other postgres) after test runs.

How to manually test:

1. Make the environment setup changes as listed in the updated README
2. ./mvnw clean verify ; podman image prune -f ; podman ps -a. There may be some containers running at this point:

CONTAINER ID  IMAGE                                COMMAND               CREATED             STATUS             PORTS                    NAMES
56b3e0c3d6b6  docker.io/testcontainers/ryuk:0.5.1  /bin/ryuk             About a minute ago  Up About a minute  0.0.0.0:38897->8080/tcp  testcontainers-ryuk-f1b8be74-163c-43aa-954a-22f4d64950db
4cbf23b40104  quay.io/cryostat/cryostat-db:latest  postgres -c fsync...  About a minute ago  Up About a minute  0.0.0.0:36511->5432/tcp  condescending_sutherland
8a61aaadfef1  docker.io/testcontainers/ryuk:0.5.1  /bin/ryuk             55 seconds ago      Up 55 seconds      0.0.0.0:36247->8080/tcp  testcontainers-ryuk-3ba85f20-bfe2-40df-813c-72e7407b8ff0

Wait a few seconds, then check podman ps -a again. After a short time, no containers should be left running.

[andrewazores]

/build_test

[github-actions]

Workflow started at 1/18/2024, 4:20:54 PM. View Actions Run.

[github-actions]

CI build and push: All tests pass ✅
https://github.com/cryostatio/cryostat3/actions/runs/7576112712

[github-actions]

CI build and push: All tests pass ✅
https://github.com/cryostatio/cryostat3/actions/runs/7576112712

[mwangggg]

lgtm