Update GitHub workflow services to pull PostgreSQL and Redis images from `mirror.gcr.io` instead of Docker Hub. This avoids anonymous pull rate‑limit failures on shared GitHub runner IPs by using the Docker Hub pull‑through cache.
Update GitHub workflow services to pull PostgreSQL and Redis images from `mirror.gcr.io` instead of Docker Hub. This avoids anonymous pull rate‑limit failures on shared GitHub runner IPs by using the Docker Hub pull‑through cache.