[milvus] allow to unset replicas field in autoscalable deployments

[Archalbc]

What this PR does / why we need it:

Hi !

If users configure HPA on their side to control index/data/query/proxy pods Deployments, we need to remove the replicas field to avoid the bad well-known HPA behavior in case of rollout-update/apply.

kubernetes/kubernetes#25238

This feature will be necessary when HPA will be available in this chart again as well :)

Fix #16

Regards,

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [mychartname])
• PR only contains changes for one chart

[sre-ci-robot]

Welcome @Archalbc! It looks like this is your first PR to zilliztech/milvus-helm 🎉

[haorenfsa]

em.. I think the 0 value of replica is meaningful when we just want stop certain component. What about add a seperated feature gate value to enable it? Or a <0 value would also be ok to me. The rest looks good.
By the way, please rebase and bump the version again.

[Archalbc]

em.. I think the 0 value of replica is meaningful when we just want stop certain component. What about add a seperated feature gate value to enable it? Or a <0 value would also be ok to me. The rest looks good. By the way, please rebase and bump the version again.

Thank you, following your idea, I pushed new changes and bumped the version.

Regards,

[haorenfsa]

@LoveEachDay PTAL

[LoveEachDay]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Archalbc, LoveEachDay

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