Devcontainer / Docker / Podman support

Maybe it would be usefulto support/put Docker (or podman, after all?) in the flatpak?

Otherwise also tings like [DevContainers](https://containers.dev/) do not work, which seem to be at least one path to a future development/way IDEs work.

Error is:
```
com.intellij.docker.agent.ApiTaskException: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (Details: [2] Datei oder Verzeichnis nicht gefunden)
```

## Alternative

Otherwise, one may also explain how to expose the host Docker deamon / or configure it? So it does not need sub-sandboxing or so which could be useful?

Start by reproducing the Docker daemon connection error in the PyCharm Flatpak and reviewing how the sandbox currently handles the host Docker socket. Compare supporting Docker or Podman with documenting host-daemon exposure, then verify that DevContainers can connect without the reported error.

Written by the indexing model from the issue text.