ci(PR): introduce new workflow PR

[clearloop]

Resolves #2875
Squashed the commits #2878 based on the current master branch

---
title: Usages of check and build
---

flowchart LR
PR --> check{check}
CI --> check

CI --> |macos=true| build
PR -->|already-A0-A2, macos?| build{build}
Label -->|A0| build
Label -->|E2| build

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• trigger build on new labels
  • no more rerunning everything on changing labels
• make the workflow of PR independent

This PR contains only 4 commits with clear purposes just for making reviewing easier

commit	description
6ee3af0	duplicate CI.yml that we can figure out the changes in the following commits
7703ed8	cherry-pick check and check-fuzzer steps from CI.yaml and create a new workflow check.yml
d3db8e5	cherry-pick build, build-win-cross and build-macos steps from CI.yaml and create a new workflow check.yml
3806481	introduce labels.yml and PR.yml
d077d52	merge the cache implementation in #3001, embedded it status check of PR.yml, for CI.yml, it's at its previous place

@gear-tech/dev

[ukint-vs]

Why there is duplicate build actions?

[StackOverflowExcept1on]

should it be duplicated here?

gear/.github/workflows/CI.yaml

Lines 44 to 48 in 7560f8f

	- name: "CACHE: Set sccache path"
	id: sccache
	run: |
	sccache_path="/mnt/sccache/$(echo ${GITHUB_REF#refs/heads/} | tr / _)"
	echo "sccache_path=$sccache_path" >> $GITHUB_OUTPUT

we have - uses: ./.github/actions/prepare-sccache