fix: ai-gateway exits 127 in all-in-one image (#5657)

[ashishkr96]

Summary

Fixes #5657 — docker run helicone/helicone-all-in-one:latest fails because the ai-gateway supervisord program loops with exit status 127 until it hits FATAL.

Root cause

supervisord.conf runs the gateway with:

[program:ai-gateway]
command=yarn start
directory=/app/gateway

This was added in d8bf4ca, but it has two problems:

1. ai-gateway is a Rust binary, not a Node project — yarn start was never the right entry point.
2. The Dockerfile additions from that same commit (COPY --from=helicone/ai-gateway:latest /app /app/gateway, the second COPY supervisord.conf, the monitor_logs.sh/debug_jawn.sh/health_check.sh copies, and the 8788 in EXPOSE) are no longer in Dockerfile, so /app/gateway doesn't exist in the published image at all.

Result: supervisord tries cd /app/gateway && yarn start, the directory doesn't exist, the process exits with 127, supervisord retries, gives up: gave up: ai-gateway entered FATAL state, too many start retries too quickly. The other commenter's "wait for DB" theory doesn't fit — the gateway exits in <1 s before any DB connect would be attempted, and a Rust DB connect failure wouldn't surface as 127.

Fix

• Dockerfile: copy the published ai-gateway binary (/usr/local/bin/ai-gateway per the upstream Helicone/ai-gateway Dockerfile) into the all-in-one image.
• supervisord.conf: invoke the binary directly; drop the bogus yarn start and the missing directory.
• Add 8788 to EXPOSE to document the gateway port.

Test plan

• docker buildx build -t helicone-all-in-one:test . succeeds
• docker run --rm -p 3000:3000 -p 8585:8585 -p 9080:9080 helicone-all-in-one:test — ai-gateway no longer enters FATAL; docker exec <id> supervisorctl status ai-gateway shows RUNNING
• curl http://localhost:8788 from inside the container responds (port not forwarded by default; use docker exec)
• Other services (web, jawn, postgres, clickhouse, minio) still come up

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