Please add support for envfile in the dapr multiapp run

[litan1106]

In what area(s)?

/area runtime

Describe the feature

Please add support for envfile in the dapr multiapp run. Currently, it only supported environment variables within the yaml file.

EnvFile example

https://docs.dapr.io/developing-applications/local-development/multi-app-dapr-run/multi-app-template/#template-file-structure

[mukundansundar]

Moving it to CLI repo.

[dapr-bot]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue, help wanted or triaged/resolved) or other activity occurs. Thank you for your contributions.

[manute]

Hey, I have created this PR and wanted to check first with you about the implementation before extending the documentation. Please let me know your thoughts about that PR when you can, thanks!