archive.ubuntu.com is unreachable from the build server, causing
apt-get to time out and fail every build. curl was only used for
the HEALTHCHECK. Replace with a zero-dependency bash TCP check:
bash -c 'echo > /dev/tcp/localhost/8080'
No packages needed, no external network access required.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
soroush.asadi