Refactor Dockerfile to improve permissions and add comments

Dockerfile

@@ -9,7 +9,6 @@ WORKDIR /app
 ENV YARN_VERSION=4.0.2
 RUN corepack enable && corepack prepare yarn@${YARN_VERSION}
 
-
 COPY package.json yarn.lock .yarnrc.yml ./
 RUN yarn install --immutable
 
@@ -37,14 +36,12 @@ ENV NODE_ENV production
 # Uncomment the following line in case you want to disable telemetry during runtime.
 ENV NEXT_TELEMETRY_DISABLED 1
 
-RUN addgroup --system --gid 1001 nodejs
-RUN adduser --system --uid 1001 nextjs
+RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 nextjs
 
 COPY --from=builder /app/public ./public
 
 # Set the correct permission for prerender cache
-RUN mkdir .next
-RUN chown nextjs:nodejs .next
+RUN mkdir .next && chown nextjs:nodejs .next
 
 # Automatically leverage output traces to reduce image size
 # https://nextjs.org/docs/advanced-features/output-file-tracing"