github.com/containers/podman/v5@v5.1.0-rc1/docs/source/markdown/options/userns.image.md (about)

     1  ####> This option file is used in:
     2  ####>   podman build, farm build
     3  ####> If file is edited, make sure the changes
     4  ####> are applicable to all of those.
     5  #### **--userns**=*how*
     6  
     7  Sets the configuration for user namespaces when handling `RUN` instructions.
     8  The configured value can be "" (the empty string) or "container" to indicate that a new user namespace is created, it can be "host" to indicate that the user namespace in which `podman` itself is being run is reused, or it can be the path to a user namespace which is already in use by another process.