Fix api container healthcheck failing with no error logs

aspnet base image ships neither curl nor wget, so the compose
healthcheck's wget call failed silently at the exec level (visible only
in docker's health-check log, not app stdout). Install curl in the
Dockerfile.ci final stage and switch the healthcheck to use it.

deploy/qa/docker-compose.qa.yml

@@ -36,7 +36,7 @@ services:
       db:
         condition: service_healthy
     healthcheck:
-      test: ["CMD-SHELL", "wget -qO- http://localhost:8080/api/v1/health 2>/dev/null || exit 1"]
+      test: ["CMD-SHELL", "curl -fsS http://localhost:8080/api/v1/health || exit 1"]
       interval: 10s
       timeout: 5s
       retries: 5