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

     1  ####> This option file is used in:
     2  ####>   podman build
     3  ####> If file is edited, make sure the changes
     4  ####> are applicable to all of those.
     5  #### **--os**=*string*
     6  
     7  Set the OS of the image to be built, and that of the base image to be pulled, if the build uses one, instead of using the current operating system of the build host. Unless overridden, subsequent lookups of the same image in the local storage matches this OS, regardless of the host.