Use testcontainers for test running

[jisantuc]

We've run into issues in projects based on this template with port conflicts in parallel CI in a Jenkins environment (see raster-foundry/granary#45). We can use testcontainers instead and not have to care about which CI environment we end up in

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[pomadchin]

Not stale, will take care of it once I'll have some time.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[pomadchin]

up.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.