Improvements to the way we start the fork

package.json

@@ -20,7 +20,7 @@
     "compile": "npm run compile:infrastructure && npm run compile:modules && npm run compile:wallet",
     "cc": "rm -rf build && rm -rf build-legacy && npm run compile:lib && npm run compile && npm run compile:legacy && npm run compile:test && npm run provision:lib:artefacts",
     "ganache": "npx ganache-cli --chainId 1895 --networkId 1597649375983 --gasLimit=20700000 -e 10000 --acctKeys=\"./ganache-accounts.json\" --deterministic",
-    "mainnet-fork": "npx ganache-cli --chainId 1895 --port 3601  --deterministic --fork https://mainnet.infura.io/v3/$(cat .env | sed -En 's/INFURA_KEY=''\"''([^''\"'']+)''\"''/\\1/p')",
+    "mainnet-fork": "bash ./scripts/start_mainnet_fork.sh",
     "test": "npx truffle test --compile-none",
     "ctest": "npm run compile && npm run test",
     "test:integration": "npx truffle test --compile-none --network prodFork test-integration/filter-lido.js",

scripts/start_mainnet_fork.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+if [ -z "$CI" ]; then
+    source .env
+
+    lsof -i tcp:3601 | grep LISTEN | awk '{print $2}' | xargs kill
+fi
+
+# Exit script as soon as a command fails.
+set -o errexit
+
+node_modules/.bin/ganache-cli --chainId 1895 --port 3601  --deterministic --fork https://mainnet.infura.io/v3/"$INFURA_KEY"