Add touchstone relative benchmarking #6

	# Modified to follow workflow in EpiNow2
	name: Continuous Benchmarks (Receive)

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref }}
	cancel-in-progress: true

	on:
	pull_request:
	paths:
	# Where model code is defined: R/, src/, inst/include/
	- "inst/include/**"
	- "src/**"
	- "R/**"
	# Benchmarking code, config file, and manual trigger
	- "touchstone/**"
	- ".github/workflows/touchstone-*.yaml"
	- ".benchmark"

	jobs:
	prepare:
	runs-on: ubuntu-latest
	# Allow benchmarking workflow to run for external contribs
	outputs:
	config: ${{ steps.read_touchstone_config.outputs.config }}
	steps:
	- name: Checkout repo
	uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- id: read_touchstone_config
	run: \|
	content=`cat ./touchstone/config.json`
	# the following lines are only required for multi line json
	content="${content//'%'/'%25'}"
	content="${content//$'\n'/'%0A'}"
	content="${content//$'\r'/'%0D'}"
	# end of optional handling for multi line json
	echo "::set-output name=config::$content"
	build:
	needs: prepare
	runs-on: ${{ matrix.config.os }}
	strategy:
	fail-fast: false
	matrix:
	config:
	- ${{ fromJson(needs.prepare.outputs.config) }}
	env:
	R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
	RSPM: ${{ matrix.config.rspm }}
	GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
	steps:
	- uses: lorenzwalthert/touchstone/actions/receive@v1
	with:
	cache-version: 1
	benchmarking_repo: ${{ matrix.config.benchmarking_repo }}
	benchmarking_ref: ${{ matrix.config.benchmarking_ref }}
	benchmarking_path: ${{ matrix.config.benchmarking_path }}

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