readme: add link to squeak-dev announcement #494

	name: Tests & Benchmarks

	on: [push, workflow_dispatch]

	env:
	SMALLTALK_IMAGE: Squeak64-Trunk
	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- id: smalltalkci
	uses: hpi-swa/setup-smalltalkCI@v1
	with:
	smalltalk-image: ${{ env.SMALLTALK_IMAGE }}
	- id: download-vm
	name: Download latest VM
	run: scripts/download_vm.sh
	- name: Run tests
	run: smalltalkci -s "${{ steps.smalltalkci.outputs.smalltalk-image }}" --vm "${{ steps.download-vm.outputs.vm-path }}" tests.smalltalk.ston
	timeout-minutes: 15
	env:
	# for uploading coverage reports
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	benchmarks:
	runs-on: ubuntu-latest
	needs: test
	steps:
	- uses: actions/checkout@v2
	- id: smalltalkci
	uses: hpi-swa/setup-smalltalkCI@v1
	with:
	smalltalk-image: ${{ env.SMALLTALK_IMAGE }}
	- id: download-vm
	name: Download latest VM
	run: scripts/download_vm.sh
	- name: Run benchmarks
	run: smalltalkci -s ${{ steps.smalltalkci.outputs.smalltalk-image }} --vm "${{ steps.download-vm.outputs.vm-path }}" benchmarks.smalltalk.ston
	timeout-minutes: 15
	env:
	TDB_BENCHMARK_RESULTS_PATH: ${{ runner.temp }}/benchmark-data.json
	- name: Download previous benchmark data
	uses: actions/cache@v1
	with:
	path: ./cache
	key: ${{ runner.os }}-benchmark
	- name: Store benchmark data
	uses: benchmark-action/github-action-benchmark@v1
	with:
	tool: customSmallerIsBetter
	output-file-path: ${{ runner.temp }}/benchmark-data.json
	auto-push: true
	gh-pages-branch: gh-pages
	comment-always: false
	fail-on-alert: false
	alert-threshold: "150%"
	github-token: ${{ secrets.GITHUB_TOKEN }}

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