Support environment variables for initContainer

[klit-la]

What would you like to be added?

With !1772 kompose supports defining initContainers via labels. Thanks for that! Now it would be great to define environment variables also via labels, such as kompose.init.containers.env

Why is this needed?

I have an application that needs to start prior to the actual application to initialize a postgres schema and the connection details need to be provided via environment variables.

[k8s-triage-robot]

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/lifecycle stale

[klit-la]

/remove-lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle stale
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale