infra: chronos: improve local cache building and explicitly outline steps #1439

	name: ClusterFuzzLite PR fuzzing
	on:
	pull_request:
	paths:
	- 'infra/**'
	permissions: read-all
	jobs:
	PR:
	runs-on: ubuntu-latest
	concurrency:
	group: ${{ github.workflow }}-${{ matrix.sanitizer }}-${{ github.ref }}
	cancel-in-progress: true
	strategy:
	fail-fast: false
	matrix:
	sanitizer:
	- address
	# Override this with the sanitizers you want.
	# - undefined
	# - memory
	steps:
	- name: Build Fuzzers (${{ matrix.sanitizer }})
	id: build
	uses: google/clusterfuzzlite/actions/build_fuzzers@v1
	with:
	language: python
	github-token: ${{ secrets.GITHUB_TOKEN }}
	sanitizer: ${{ matrix.sanitizer }}
	# Optional but recommended: used to only run fuzzers that are affected
	# by the PR.
	# See later section on "Git repo for storage".
	# storage-repo: https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/OWNER/STORAGE-REPO-NAME.git
	# storage-repo-branch: main # Optional. Defaults to "main"
	# storage-repo-branch-coverage: gh-pages # Optional. Defaults to "gh-pages".
	- name: Run Fuzzers (${{ matrix.sanitizer }})
	id: run
	uses: google/clusterfuzzlite/actions/run_fuzzers@v1
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}
	fuzz-seconds: 600
	mode: 'code-change'
	sanitizer: ${{ matrix.sanitizer }}
	# Optional but recommended: used to download the corpus produced by
	# batch fuzzing.
	# See later section on "Git repo for storage".
	# storage-repo: https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/OWNER/STORAGE-REPO-NAME.git
	# storage-repo-branch: main # Optional. Defaults to "main"
	# storage-repo-branch-coverage: gh-pages # Optional. Defaults to "gh-pages".

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