Add CS audit #346

	name: Echidna

	on: [push, pull_request]

	jobs:
	echidna:
	name: Echidna
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	testName:
	- DssVestMintableEchidnaTest
	- DssVestSuckableEchidnaTest
	- DssVestTransferrableEchidnaTest

	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Set up Python 3.8
	uses: actions/setup-python@v4
	with:
	python-version: 3.8

	- name: Install crytic-compile
	run: pip3 install crytic-compile

	- name: Install solc-select
	run: pip3 install solc-select

	- name: Solc Select 0.6.12
	run: \|
	solc-select install 0.6.12
	solc-select use 0.6.12

	- name: Crytic Compile ${{ matrix.testName }}
	run: \|
	crytic-compile echidna/${{ matrix.testName }}.sol --solc-args "--optimize --optimize-runs 200" --export-format solc
	jq --sort-keys . crytic-export/combined_solc.json > sorted_crytic_solc.json

	- name: Cache ${{ matrix.testName }} Corpus
	uses: actions/cache@v3
	with:
	path: corpus
	key: abi-${{ matrix.testName }}-${{ hashFiles('**/sorted_crytic_solc.json') }}-v3

	- name: Fuzz ${{ matrix.testName }}
	uses: crytic/echidna-action@v2
	with:
	files: echidna/${{ matrix.testName }}.sol
	contract: ${{ matrix.testName }}
	config: echidna.config.ci.yml
	corpus-dir: corpus
	test-mode: assertion
	test-limit: 250000
	seq-len: 100
	solc-args: --optimize --optimize-runs 200
	solc-version: 0.6.12
	echidna-version: v2.0.0

	- name: Upload ${{ matrix.testName }} Coverage
	uses: actions/upload-artifact@v3
	with:
	name: coverage-${{ matrix.testName }}
	path: corpus/covered.*

Provide feedback