Use user to launch nuxt app, use bun preset for nitro

Dockerfile.prod

@@ -12,9 +12,14 @@ RUN bun --bun run build
 
 # Launch
 FROM oven/bun:1 AS production
+RUN groupadd --gid 1001 nuxt-app \
+  && useradd --uid 1001 --gid nuxt-app \
+  --shell /bin/bash --create-home nuxt-app
+
+USER nuxt-app:nuxt-app
 WORKDIR /app
 
 COPY --from=build /app/.output /app
 
-EXPOSE 80/tcp
+EXPOSE 3000/tcp
 ENTRYPOINT [ "bun", "--bun", "run", "/app/server/index.mjs" ]