Additional Go Build flags in go/build pipeline

[debasishbsws]

Fixes: #474
cc @developer-guy

This provides an additional option for go/build pipeline. as described in issue #474, If we want to pass additional flags like -gcflags for memory optimization or -mod=vendor or -mod=mod etc we can't do that via current pipeline.

Uses:

  - uses: go/build
    with:
      modroot: build-dir
      tags: enterprise
      packages: ./main.go
      output: hello
      flags: -mod=vendor -gcflags="-m=2"  # <-- additional any custom options we want to specify for go build.

Functional Changes

• This change can build all of Wolfi without errors (describe results in notes)

Notes:
It will not affect any previous build but just going to give more flexibility in using go/build pipeline

SCA Changes

• Examining several representative APKs show no regression / the desired effect (details in notes)

Notes:

Linter

• The new check is clean across Wolfi
• The new check is opt-in or a warning