Podman(1) not working inside JupyterLab containers that are launched by JupyterHub

SOLUTION (2nd snippet of UPDATE3):

c.DockerSpawner.extra_host_config.update(
   binds = {'/sys/fs/cgroup' :
              {'bind' : '/sys/fs/cgroup',
               'mode' : 'ro' }})

I had already solved the privileged container dilemma; and integrating that solution with the above solution, yields the (final) complete solution:

c.DockerSpawner.extra_host_config.update(
   {"privileged" : True},
   binds = {'/sys/fs/cgroup' :
              {'bind' : '/sys/fs/cgroup',
               'mode' : 'ro' }})
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