Helm Install-Upgrade ETCD fix.

[anthonylasso]

Description

This PR creates a configmap that dynamically sets the ETCD_INITIAL_CLUSTER_STATE env variable that is read by the ETCD statefulset This means we can skip needing to pass the value during helm upgrades.

⚠️ Important Note ⚠️

When upgrading a cluster, we may want to keep the currently installed release values, while also including any new chart values/props that may have changed.

First save the existing release values to a .yaml file. Then use the -f flag with the filename in the upgrade command to port them to the new release.

• helm get values featureform -o yaml > ff.yaml
• helm upgrade -f ff.yaml featureform ./charts/featureform --version x.y.z

closes #526-ent

install / upgrade

env check

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Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have fixed any merge conflicts