Configure nixpacks to use Caddy

frontend/Caddyfile

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+{
+	# global options
+	admin off # theres no need for the admin api in railway's environment
+	persist_config off # storage isn't persistent anyway
+	auto_https off # railway handles https for us, this would cause issues if left enabled
+	log {
+		# runtime logs
+		format json # set runtime log format to json mode 
+	}
+	servers {
+		# server options
+		trusted_proxies static private_ranges 100.0.0.0/8 # trust railway's proxy
+	}
+}
+
+# site block, listens on the $PORT environment variable, automatically assigned by railway
+:{$PORT} {
+	respond /health 200
+	encode gzip
+
+	log {
+		# access logs
+		format json # set access log format to json mode
+	}
+
+	handle /api/* {
+		reverse_proxy {$BACKEND_URL} # reverse proxy to the backend
+	}
+
+	handle {
+		root * dist
+		file_server
+		# if path doesn't exist, redirect it to 'index.html' for client side routing
+		try_files {path} /index.html
+	}
+}