[DPE-10291]: rootless k8s#75
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This pull request introduces and tests support for running the Valkey charm and its workload container as a non-root user. It updates configuration, file paths, and adds comprehensive integration tests to verify rootless operation and related behaviors.
Rootless operation and security improvements:
metadata.yamlis updated to specifycharm-user: non-root, and thevalkeycontainer is explicitly configured to run as a dedicated non-root user and group (uid/gid584792)./var/log,/etc/ssl/certs) to non-privileged, writable locations (charm_dir), ensuring compatibility with non-root operation.Testing and validation:
test_rootless.py) is added to verify that both the charm and workload containers do not run as root, lack sudo privileges, and that all relevant files (logs, certificates) are written to non-privileged locations. The tests also verify correct behavior during TLS enablement and after failover events.