- Specify registries in Dockerfiles such that Podman can resolve the dependencies
- Add a name for the PHP container, such that the commands work when using `exec -it linkace-php`
- Mention in CONTRIBUTING.md that Podman works also
- Update the PHP version in CONTRIBUTING.md as proposed in https://github.com/Kovah/LinkAce/discussions/746#discussioncomment-9101259