chore: moves next config to typescript

Also adds DOCKER_BUILD env variable in prepare for moving out from github workflows

next.config.ts

@@ -0,0 +1,17 @@
+import type { NextConfig } from 'next'
+
+const imageDomains = (process.env.IMAGE_DOMAINS ?? '').split(',').map((domain) => {
+  return new URL(domain)
+})
+
+const IS_DOCKER_BUILD = process.env.DOCKER_BUILD === 'true'
+
+const nextConfig: NextConfig = {
+  output: IS_DOCKER_BUILD ? 'standalone' : undefined,
+  reactStrictMode: true,
+  images: {
+    remotePatterns: imageDomains
+  }
+}
+
+module.exports = nextConfig