Fix: use static uid; publish latest tag; extend memory

[dheeg]

Thanks for providing the tool.

While deploying the first time, I needed to fix a few things which should be hopefully fixed by this PR.

1. Without a static UID, Kubernetes refuses to start the container if runAsNonRoot: true is set
2. The AWS cronjob needs ~12GB of memory to finish successfully. I don't have the usage numbers of the azure and ghcp cronjob but extended those limits and requests as well
3. The AWS cronjob might need longer with smaller DBs, extend the time between cronjobs a bit
4. The :latest tag (or image in general) is currently not published to GitHub registry, but it's referenced in the Kubernetes manifests