Add no_prelude remote execution to github actions

[adam-singer]

Enabling testing of remote execution on github actions for no_prelude

• Create github action that generates .buckconfig.local using NATIVELINK_HEADER_RW_KEY from gha secrets.
• Set container-image used for remote execution specific to setup of buck2.
• Update .gitignore to include .buckconfig.local.
• Include a platforms configuration for the no_prelude example.
• Update go_toolchain.bzl to be remote enabled friendly, no need to download a toolchain when remote worker has one.

Open question:

• Was the downloading of go toolchain to be remote execution compatible prior to this change?

cc: @JakobDegen

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[alexlian]

Closing this for now in lieu of just getting the other example and buck2 building up first.