fix: server Dockerfile - corrected final step - using RUN instruction instead...

fix: server Dockerfile - corrected final step - using RUN instruction instead of the CMD as a preparation for a multi-stage

backend/Dockerfile

@@ -13,4 +13,4 @@ RUN npx prisma generate
 
 COPY . .
 
-CMD ["npm", "run", "build"]
+RUN npm run build