.gitignore's ".next/" rule (no leading slash) matched at any depth, so
build/.next was silently excluded from every commit even though build.sh
populates it. The Docker image was built without the compiled server/static
output, so server.js had nothing to serve. Anchor the rule to the repo root
and commit the compiled output that Dokploy actually needs.
Dokploy domains were configured to route to internal port 80, but the
Node standalone server listened on 3000, causing Bad Gateway. Align
the container's PORT/EXPOSE with Dokploy's routing instead.
The standalone build runs on macOS and bundles darwin-arm64 native
sharp binaries. These crash immediately on the Alpine Linux container,
causing the Node process to exit and Dokploy's reverse proxy to return
a 502 Bad Gateway.
This adds a RUN step to remove the macOS binaries and install the
correct @img/sharp-linuxmusl-x64 package at build time.
