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This pull request adds the small
is_container
charm library. This utility enables us to check if the current charm is running within a container using thesystemd-detect-virt
utility.Why add this library? In multiple places we're using a utility like this - like both the Slurm and NFS operators - so it would be good to just have one source of truth for this method. We can also extend as necessary to detect multiple different container runtimes.