fix: Correct Dockerfile FROM AS casing

- Change 'as build' to 'AS build' to follow Docker best practices
- Fixes Docker build warning about casing mismatch

Dockerfile

@@ -1,5 +1,5 @@
 # Use the official Node.js runtime as the base image
-FROM node:22 as build
+FROM node:22 AS build
 
 # Set the working directory in the container
 WORKDIR /app