Fix legacy nomenclature

Dockerfile

@@ -20,7 +20,7 @@ COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 
 # Build the Next.js application for production
-ENV NODE_ENV production
+ENV NODE_ENV=production
 RUN npm run build
 
 # Stage 3: Run the Next.js application (flexible for dev and prod)
@@ -44,7 +44,7 @@ EXPOSE 3000
 
 # Argument to set NODE_ENV at runtime
 ARG NODE_ENV=production
-ENV NODE_ENV ${NODE_ENV}
+ENV NODE_ENV=${NODE_ENV}
 
 # Command to run the Next.js application
 # This will run 'npm run dev' if NODE_ENV is 'development', otherwise 'npm start' (production)