updates dockerfile

docker/staging/Dockerfile

@@ -23,7 +23,7 @@ WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 # This will do the trick, use the corresponding env file for each environment.
-COPY .env.staging.example .env.production
+# COPY .env.staging.example .env.production
 RUN npm run build
 
 # 3. Production image, copy all the files and run next