Add cross-env

package.json

@@ -19,7 +19,7 @@
   },
   "scripts": {
     "start": "react-app-rewired start",
-    "start:prod": "REACT_APP_QUERY_NODE_URL=https://hydra.joystream.org/graphql REACT_APP_ORION_URL=https://orion.joystream.org/graphql REACT_APP_STORAGE_NODE_URL=https://rome-rpc-endpoint.joystream.org/asset/v0/ yarn start",
+    "start:prod": "cross-env REACT_APP_QUERY_NODE_URL=https://hydra.joystream.org/graphql REACT_APP_ORION_URL=https://orion.joystream.org/graphql REACT_APP_STORAGE_NODE_URL=https://rome-rpc-endpoint.joystream.org/asset/v0/ yarn start",
     "dev": "yarn start",
     "dev:prod": "yarn start:prod",
     "build": "react-app-rewired build",
@@ -72,6 +72,7 @@
     "apollo": "^2.30.2",
     "babel-jest": "26.6.3",
     "babel-plugin-emotion": "^10.0.33",
+    "cross-env": "^7.0.3",
     "csstype": "^3.0.0-beta.4",
     "customize-cra": "^1.0.0",
     "date-fns": "^2.15.0",

yarn.lock

@@ -7378,6 +7378,13 @@ create-react-context@0.3.0, create-react-context@^0.3.0:
     gud "^1.0.0"
     warning "^4.0.3"
 
+cross-env@^7.0.3:
+  version "7.0.3"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-7.0.3.tgz#865264b29677dc015ba8418918965dd232fc54cf"
+  integrity sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==
+  dependencies:
+    cross-spawn "^7.0.1"
+
 cross-fetch@3.0.6:
   version "3.0.6"
   resolved "https://registry.yarnpkg.com/cross-fetch/-/cross-fetch-3.0.6.tgz#3a4040bc8941e653e0e9cf17f29ebcd177d3365c"
@@ -7396,7 +7403,7 @@ cross-spawn@6.0.5, cross-spawn@^6.0.0, cross-spawn@^6.0.5:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-cross-spawn@7.0.3, cross-spawn@^7.0.0, cross-spawn@^7.0.2:
+cross-spawn@7.0.3, cross-spawn@^7.0.0, cross-spawn@^7.0.1, cross-spawn@^7.0.2:
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
   integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==