Migrate to Helm v3, Change dependencies from deprecated official helm charts to Bitnami charts

[ghost]

Closes #154
Closes #98

[ghost]

This likely needs a good test before its accepted into the branch, I have given it the best tests I can in the environments I have available to me

[arm4b]

Thanks for the contribution!
Great work with details: Helm values for dependencies and connection strings. 👍

I provided a few comments to address and let's see if we could get the CI e2e tests happy first.

[arm4b]

Thanks for the changes!

Let's try to fix the CI so it works with Helm v3. I left a few pointers in the comments.

[ghost]

Found another potential issue running upgrade with helm.. I can't decide if this is an error or configuration, maybe config

Error: UPGRADE FAILED: template: stackstorm-ha/charts/mongodb/templates/NOTES.txt:192:4: executing "stackstorm-ha/charts/mongodb/templates/NOTES.txt" at <include "common.errors.upgrade.passwords.empty" (dict "validationErrors" (list $requiredPasswordValidationErrors) "context" $)>: error calling include: template: stackstorm-ha/charts/mongodb/charts/common/templates/_errors.tpl:18:48: executing "common.errors.upgrade.passwords.empty" at : error calling fail:
PASSWORDS ERROR: you must provide your current passwords when upgrade the release
'auth.rootPassword' must not be empty, please add '--set auth.rootPassword=$MONGODB_ROOT_PASSWORD' to the command. To get the current value:

    export MONGODB_ROOT_PASSWORD=$(kubectl get secret --namespace test stackstorm-ha-mongodb -o jsonpath="{.data.mongodb-root-password}" | base64 --decode)

[ghost]

Ok sorted that now

[arm4b]

Oh wow, e2e CI tests are green under Helm v3 👍 @Christopher-Russell That's a ton of great work!

I left a few more minor comments below.

[arm4b]

Also please check the https://github.com/StackStorm/stackstorm-ha#requirements README section, - that needs an update too following Helm v3 migration.

[arm4b]

@Christopher-Russell Thanks a lot for the contribution! It's massive effort and great work here! 👍

I'm approving this PR and planning to merge it closer to the v0.50.0 release due to its breaking change nature.
I'd also welcome more community testing for this PR.

[arm4b]

@Christopher-Russell Feel free to also include your name or nickname here as someone who contributed this work.