Add explicit calls to read config values from .env files when generating Next config for server

I thought Next's `loadConfig` function implicitly read .env files, but I was wrong.

Author: CMeeg

.nvmrc

@@ -0,0 +1 @@
+v16.x

package-lock.json

@@ -6,7 +6,7 @@
   "scripts": {
     "config:generate": "node ./server/generate-config.js",
     "dev": "next dev",
-    "build": "npm run config:generate & npm run build:next",
+    "build": "npm run config:generate && npm run build:next",
     "build:next": "next build",
     "lint": "next lint",
     "start": "node server.js"
@@ -18,6 +18,7 @@
   "dependencies": {
     "@microsoft/applicationinsights-web": "^2.8.5",
     "applicationinsights": "^2.3.3",
+    "dotenv": "^16.0.3",
     "next": "^12.2.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",

package.json

@@ -1,3 +1,7 @@
+require('dotenv').config({ path: './.env', override: true })
+require('dotenv').config({ path: './.env.production', override: true })
+require('dotenv').config({ path: './.env.local', override: true })
+
 const path = require('path')
 const fs = require('fs')
 const loadConfig = require('next/dist/server/config').default
@@ -7,7 +11,6 @@ loadConfig('phase-production-build', path.join(__dirname), nextConfig).then(
   (config) => {
     config.distDir = './.next'
     config.configOrigin = 'next.config.js'
-    /* eslint-enable no-param-reassign */
 
     fs.writeFileSync('next.config.json', JSON.stringify(config))
   }