[gitops] Fix kubelinter errors

[keiranjprice101]

Description of the issue

When running kube-linter (part of #14 )

There are currently 139 errors. over 200 errors across 26 + unique rule violations.

These mainly relate to container permissions e.g. running as root / read only filesystems / cpu and memory limits etc.
Initially it appeared to be limited to a few types as previously mentioned above, but upon rescanning after ignoring / attempting to correct some of these, then rescanning. More were actually printed. As of the latest commit on main e558423
These are the types of rule violations:

• access-to-create-pods
• dangling-servicemonitor
• default-service-account
• dnsconfig-options
• exposed-services
• host-network
• host-pid
• latest-tag
• minimum-three-replicas
• mismatching-selector
• no-liveness-probe
• no-node-affinity
• no-read-only-root-fs
• no-readiness-probe
• no-rolling-update-strategy
• non-existent-service-account
• non-isolated-pod
• privilege-escalation-container
• privileged-container
• privileged-ports
• read-secret-from-env-var
• required-annotation-email
• required-label-owner
• run-as-non-root
• unset-cpu-requirements
• unset-memory-requirements

For context, I generated the exact list with the following:
kube-linter lint . | grep -o '(check: [a-zA-Z\-]*,' | sort | uniq | sed 's/(check: \(.*\),/\1/'

We should investigate fixing them . Before #14