Setup multistage build to allow running backend server in dev mode so we dont have to run it outside Docker

This will automatically restart the backend server in docker anytime there are changes to the original
source files instead of copying over when running in dev mode. In production, it will still do the
normal copy/build.

packages/backend/package.json

@@ -7,7 +7,7 @@
     "start": "yarn start:backend",
     "start:backend": "node ./dist/index.js",
     "start:backend:dev": "yarn dev",
-    "dev": "ts-node-dev --respawn --transpileOnly src/index.ts",
+    "dev": "ts-node-dev --exit-child --respawn --transpileOnly src/index.ts",
     "typecheck": "tsc --noEmit",
     "build": "tsc"
   },
@@ -19,13 +19,13 @@
     "body-parser": "^1.19.0",
     "ethers": "^4.0.46",
     "express": "^4.17.1",
-    "node-fetch": "^2.6.0",
-    "ts-node-dev": "^1.0.0-pre.44"
+    "node-fetch": "^2.6.0"
   },
   "devDependencies": {
     "@types/express": "^4.17.6",
     "@types/node": "^13.11.1",
     "@types/node-fetch": "^2.5.6",
+    "ts-node-dev": "^1.0.0-pre.50",
     "typescript": "^3.8.3"
   }
 }

packages/backend/tsconfig.json

@@ -1,7 +1,7 @@
 {
   "extends": "../../tsconfig.base.json",
   "compilerOptions": {
-    "rootDir": "src",
+    "rootDir": "./src",
     "outDir": "./dist",
     "typeRoots": [
       "../@types", "../../node_modules/@types"]

packages/utils/package.json

@@ -10,7 +10,7 @@
     "start:backend:dev": "yarn watch",
     "prepare": "yarn build",
     "build": "tsc",
-    "watch": "tsc"
+    "watch": "tsc -w"
   },
   "dependencies": {
     "ethers": "^4.0.47",