* test: add mock method for absolute files
Signed-off-by: Harald Hoyer <harald@hoyer.xyz>
* feat(module): add a container indicator module
Adds a container type indicator, if inside a container,
detected via the presence of some marker files.
E.g. inside a podman container entered with `toolbox enter`
the prompt changes to the container name and version.
```
starship on container_rebased [$!] is 📦 v1.0.0 via 🦀 v1.56.1
❯ toolbox enter
starship on container_rebased [$!] is 📦 v1.0.0 via 🦀 v1.56.1
⬢ [fedora-toolbox:35] ❯
```
Signed-off-by: Harald Hoyer <harald@hoyer.xyz>
