Changed to containerization related files in order to move to rootless podman

[epag]

Currently all of these changes are simply being stored locally on my machine. Its due time I put them here just for safety sake

[epag]

I pushed the commit, unsure if this will cause our local tests to fail due to the changes, but if it does then I wouldn't be surpised. This isnt merged into master though so we should be fine

[james-d-brown]

We do not currently have any automated tests of cowres, so nothing you push will break anything. Our topmost level of integration testing right now is system testing, which tests a standalone instance in various deployment modes (in memory, database. h2 etc.).

[james-d-brown]

By the way, this obviously isn't great, i.e., there's no way of knowing when we break something related to the broader service deployment, like docker config, until we manually test it. But at least we're heading in a better direction with more automated deployments, if not automated tests of cowres once deployed.