The Robokassa credentials reached only the test contour (ci.yaml → TEST_
secrets). The prod-deploy / prod-rollback workflows and write-prod-env.sh
never rendered BACKEND_ROBOKASSA_*, so on prod the shop login was empty and
the direct RUB rail stayed disabled — the PROD_BACKEND_ROBOKASSA_* secrets
went nowhere.
Export the shop login + Password1/Password2 (secrets) and a
BACKEND_ROBOKASSA_TEST flag (a variable, so go-live is a flag flip not a
secret rotation) from both prod workflows, and emit the four ROBOKASSA_*
vars from write-prod-env.sh (the shared deploy/rollback env renderer) so a
rollback keeps the rail up. The compose already maps ROBOKASSA_* →
BACKEND_ROBOKASSA_*. Document the new secrets/variable in the deploy README
and .env.example. Password3 (Robokassa's JWT-invoice API) is unused.