[agent] chart overhaul

[jamiezieziula]

This PR rebuilds the prefect-agent chart using bitnamis common as its base.

Related to #44

[jawnsy]

Doesn't need to be in this PR, but should we have a more comprehensive notes file, since this is shown whenever helm install or helm upgrade finishes?

[jamiezieziula]

uncommenting this by default to grant it better visibility

[jawnsy]

LGTM! Thank you!

[jamiezieziula]

FYI relevant kube lint flagged issues below. Unfortunately we cannot set container security context as the prefect image expects the agent to run as the root user, otherwise it is unable to create the /.prefect directory & access other relevant directories like /opt/prefect cc: @madkinsz

KubeLinter 0.5.0

agent.yaml: (object: test-helm/prefect-agent apps/v1, Kind=Deployment) container "prefect-agent" does not have a read-only root file system (check: no-read-only-root-fs, remediation: Set readOnlyRootFilesystem to true in the container securityContext.)

agent.yaml: (object: test-helm/prefect-agent apps/v1, Kind=Deployment) container "prefect-agent" is not set to runAsNonRoot (check: run-as-non-root, remediation: Set runAsUser to a non-zero number and runAsNonRoot to true in your pod or container securityContext. Refer to https://kubernetes.io/docs/tasks/configure-pod-container/security-context/ for details.)

agent.yaml: (object: test-helm/prefect-agent apps/v1, Kind=Deployment) container "prefect-agent" has cpu request 0 (check: unset-cpu-requirements, remediation: Set CPU requests and limits for your container based on its requirements. Refer to https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#requests-and-limits for details.)

agent.yaml: (object: test-helm/prefect-agent apps/v1, Kind=Deployment) container "prefect-agent" has cpu limit 0 (check: unset-cpu-requirements, remediation: Set CPU requests and limits for your container based on its requirements. Refer to https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#requests-and-limits for details.)

agent.yaml: (object: test-helm/prefect-agent apps/v1, Kind=Deployment) container "prefect-agent" has memory request 0 (check: unset-memory-requirements, remediation: Set memory requests and limits for your container based on its requirements. Refer to https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#requests-and-limits for details.)

agent.yaml: (object: test-helm/prefect-agent apps/v1, Kind=Deployment) container "prefect-agent" has memory limit 0 (check: unset-memory-requirements, remediation: Set memory requests and limits for your container based on its requirements. Refer to https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#requests-and-limits for details.)