Dockerfile: fixed installation of prod dependencies

Dockerfile

@@ -13,14 +13,18 @@ RUN npm i && npm cache clean --force
 # building app
 RUN npm run build
 
+# remove dev dependencies
+RUN rm -rf node_modules
+
+# installing production dependencies
+RUN npm i --verbose --only=production && npm cache clean --force
+
 # Stage 2: Run the Next.js server
 FROM gcr.io/distroless/nodejs:18 as prod-image
 
 WORKDIR /app
 
 COPY --from=builder /app/package.json /app/package-lock.json ./
-# installing production dependencies
-RUN npm i --verbose --only=production && npm cache clean --force
 
 COPY --from=builder /app/.next ./.next
 COPY ./public /app/public