CI Docker build timeout for payment-service #38

Problem

Docker builds (payment-service) failed on every recent push while the other Docker matrix services passed.

Failing run: https://github.com/Hqzdev/Metrix/actions/runs/27071836521

Root cause

The failing job did not reach payment-service application code. The Docker build failed while resolving the shared base image metadata:

failed to resolve source metadata for docker.io/library/node:22-alpine
dial tcp registry-1.docker.io:443: i/o timeout

All Docker matrix services use apps/bot/Dockerfile.service; the payment-service matrix runner independently hit a transient Docker Hub registry/network timeout while neighboring matrix jobs completed.

Investigation notes

• Dockerfile syntax and service-specific build context were not the first failure point.
• CI workflow passes SERVICE_NAME=payment-service into the same Dockerfile used by the other services.
• Recent relevant CI commits do not show a payment-service-only change that explains this failure.
• Vercel production deployment completed separately; this failure is isolated to the GitHub Actions service image build.

Follow-up PRs

• fix(ci): retry docker service builds #35 adds Docker build retries.
• docs(ci): document docker build timeout #36 documents the runbook/root cause.
• ci(docker): print build diagnostics #37 adds Docker build diagnostics.