can't install packages when using proot

[LukeLabrie]

I am running junest in a manjarolinux/base docker container based on this image. When I try to run junest I get the following error

getent command failed or does not exist. Binding directly from /etc/passwd.
bwrap: No permissions to creating new namespace, likely because the kernel does not allow non-privileged user namespaces. On e.g. debian this can be enabled with 'sysctl kernel.unprivileged_userns_clone=1'.
Error: Something went wrong while executing bwrap command. Exiting
/home/myuser/junest/lib/core/wrappers.sh: line 25: mkdir: No such file or directory

after reading this issue I try running junest proot -f, I no longer get the above error, but when I try to install packages with yay, for instance yay -S openmc-git, I get the following error

 -> error fetching openmc-git:  
	 context: exec: "systemd-run": executable file not found in $PATH
error fetching nuclear-data:  
	 context: exec: "systemd-run": executable file not found in $PATH
error fetching python-cad_to_openmc:  
	 context: exec: "systemd-run": executable file not found in $PATH
error fetching moab:  
	 context: exec: "systemd-run": executable file not found in $PATH
error fetching dagmc-git:  
	 context: exec: "systemd-run": executable file not found in $PATH
error fetching double-down-git:  
	 context: exec: "systemd-run": executable file not found in $PATH

I tried sudo find / -name systemd-run and it was nowhere to be found. Does proot not have the systemd executables? I have a feeling it might have something to do with running in a docker container. I've done that before without issue, but now I am using a different computer.

Any ideas?