Add ability to add custom environment variable to dapr control plane

[filintod]

In what area(s)?

/area runtime

Need a way to specify soft memory limit (ie GOMEMLIMIT) to dapr system. This comes handy when setting memory limit on container so the Go runtime can try to release memory before OOMKilled happens. Another options would be to add it in code https://pkg.go.dev/runtime/debug#SetMemoryLimit but this way is configurable by the customer directly as adding it in code will still require some kind of user interaction (ie set it at 90% or 95%, etc).

What version of Dapr?

1.1.x
1.0.x
edge: output of git describe --dirty

Expected Behavior

I should be able to say, in the corresponding chart:

extraEnvVars:
- name: GOMEMLIMIT
  value: 900MiB

and this is set to the corresponding deployment/sts for the container in the chart.

Actual Behavior

There is no option for this

Steps to Reproduce the Problem

Release Note

RELEASE NOTE:

[filintod]

/assign