[Feature Request]: allow GOBUILD_OPT pass to Makefile

[cpegeric]

Is there an existing issue for the same feature request?

• I have checked the existing issues.

Is your feature request related to a problem?

make build cannot specify extra build opt from environment variable.

Describe the feature you'd like

allow GOBUILD_OPT pass to Makefile to support extra go build compiler flag.

e..g.
make GOBUILD_OPT=-cover
to build executable with coverage test support.

Describe implementation you've considered

No response

Documentation, Adoption, Use Case, Migration Strategy

No response

Additional information

No response