The primary goals of this PR are:
* Better parallelization for github workflows and local builds
* Allow easily running the github workflows locally

Changes:
* Makefile now describes dependencies among targets to enable parallel
jobs
* Created `release` target to be called from the release workflow
    * Creates temporary build folders to isolate symlinks
* Created `release-test` target to be called form the test workflow
* Makefile now has a release target which will concurrently build all 4
archives
* Added -j flag to Makefile so it may create multiple jobs
    * This should leverage all cpus 4 cpu machines we will build on
* I've made the arch explicit (GOOS=amd64) for x86 binary for safety
* For now I've preserved the existing targets for "make build" and "make
build-strip", but ideally:
* `make build` only builds using `CGO_ENABLED=0 go build` giving native
arch for local dev.
* `make release` builds all the release binaries, without any env
defined values such as `CGO_ENABLED=0 go build` (it is currently doing
this now)
* I've collapsed the test workflows into one step so they can run
concurrently

One note is that the go tool chain does make use of multiple cpus. But
there should still be measurable benefits on 4 cpu machines with these
changes.

Related:
#2429

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Co-authored-by: Chris Stockton <chris.stockton@supabase.io>