create(go): add -s -w ldflags to reduce the artifact size

[chenrui333]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

It is consistent with the go formulae practices we are doing in the homebrew-core

This is the article reference for shrinking the binary (thanks @bayandin)

[BrewTestBot]

Review period will end on 2021-08-24 at 00:00:00 UTC.

[BrewTestBot]

Review period ended.