refactor: streamline container setup and dependencies

- Remove `xz-utils` from initial package install
- Remove password/secret check in `obj_init`
- Add on-demand `crun` installation during container create
- Import `herorunner_installer` for `crun` setup

lib/installers/virt/herorunner/herorunner_model.v

@@ -18,9 +18,6 @@ pub mut:
 // your checking & initialization code if needed
 fn obj_init(mycfg_ HeroRunner) !HeroRunner {
 	mut mycfg := mycfg_
-	if mycfg.password == '' && mycfg.secret == '' {
-		return error('password or secret needs to be filled in for ${mycfg.name}')
-	}
 	return mycfg
 }