Why do we build using go build -a and have removed buildkit caching?

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Bug description

It currently takes an hour to build tanzu framework to any reasonable state on a Ryzen 5900X with 64GB RAM.

Is there a particular reason to use go build -a when the golang compiler does reproducible builds when not using cgo?
Also, it seems we used to use buildkit caching going by some of the comments in the Dockerfiles, but that this was removed. Is there a reason for doing so?

Expected behavior
Builds take a lot less than 1 hour.

Steps to reproduce the bug

Version (include the SHA if the version is not obvious)

Environment where the bug was observed (cloud, OS, etc)

Relevant Debug Output (Logs, manifests, etc)

[stmcginnis]

I am not able to find a case of using go build -a. Can you specify what command you are running to see that? From our normal make targets we use the builder plugin to generate a consistent build command. I'm not seeing -a being used in that:

ℹ  🐶 - $ /usr/local/bin/go build \
  -o /Users/smcginnis/src/vmware-tanzu/tanzu-framework/artifacts-admin/linux/amd64/cli/codegen/v0.24.0-dev/tanzu-codegen-linux_amd64 \
  -ldflags -s -w -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/buildinfo.Date=2022-06-23' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/buildinfo.SHA=c5b09db1-dirty' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/buildinfo.Version=v0.24.0-dev' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/buildinfo.IsOfficialBuild=' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/config.DefaultStandaloneDiscoveryRepository=projects-stg.registry.vmware.com/tkg' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/cli/common.IsContextAwareDiscoveryEnabled=true' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/config.DefaultStandaloneDiscoveryImagePath=packages/standalone-plugins' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/config.DefaultStandaloneDiscoveryImageTag=v0.24.0-dev' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/config.DefaultStandaloneDiscoveryLocalPath=standalone' \
  -X 'github.com/vmware-tanzu/tanzu-framework/pkg/v1/config.DefaultStandaloneDiscoveryType=local' \
  -tags  ./cmd/cli/plugin-admin/codegen

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