Codex Cloud has severe issues with hex.pm (Elixir package manager)

Alright, I put my final solution into a small Golang proxy. With this set I can now natively resolve hex.pm packages in Codex

Maintenance Script:

mise use -g go:github.com/dvcrn/hexpm-envoy-proxy@latest
if ! pgrep -f hexpm-envoy-proxy > /dev/null 2>&1; then
  nohup mise x -- hexpm-envoy-proxy > /tmp/hexpm-envoy-proxy.log 2>&1 &
  disown
  sleep 2
fi
# Wait for proxy to be ready (up to 5s)
for i in $(seq 1 10); do
  if curl -s -o /dev/null -w '' http://127.0.0.1:8787/ 2>/dev/null; then
    echo "hexpm-envoy-proxy is ready"
    break
  fi
  sleep 0.5
done

cat /tmp/hexpm-envoy-proxy.log
mix deps.get

Set these environment variables in Codex:

• HEX_MIRROR = http://127.0.0.1:8787
• HEX_BUILDS_URL = http://127.0.0.1:8787/builds

This script will use mise to install my hexpm-envoy-proxy and point hex to use that proxy for package resolution. The proxy will rewrite the headers to work with envoy