DL-176

CI Postgres is the shipped GitHub Actions SERVICE CONTAINER — digest-pinned postgres:16-alpine, health-gated, URL-form TCP DSN, digest kept equal to pgtest.go’s image pin — not the ancestor record’s per-step embedded postgresql_18 postmaster, which solved a Woodpecker constraint compass does not have (D-A2)

Status: Active (Matt, 2026-08-07)

Record: ../../meta/compass-test-strategy/design.md#a2–postgres-provisioning-in-ci-the-shipped-service-container-amends-the-ancestor-records-d4