busybox wget in alpine resolves "localhost" to ::1 first, but our nginx
`listen 80` is IPv4-only, so the healthcheck got Connection refused and
Coolify marked the container running:unhealthy (which also made Traefik
skip its router and fall back to the lower-priority extension-platform
catch-all). Hard-coding 127.0.0.1 fixes that.
Also clear /usr/share/nginx/html before COPY so the base image's
50x.html/index.html don't leak into the published artifact set.
chaim
46955e2064