set testnet registry address

Author: EasterTheBunny

framework/components/dockercompose/billing_platform_service/docker-compose.yml

@@ -21,6 +21,7 @@ services:
       MAINNET_WORKFLOW_REGISTRY_CHAIN_SELECTOR: ${MAINNET_WORKFLOW_REGISTRY_CHAIN_SELECTOR:-}
       TESTNET_WORKFLOW_REGISTRY_CHAIN_SELECTOR: ${MAINNET_WORKFLOW_REGISTRY_CHAIN_SELECTOR:-}
       MAINNET_WORKFLOW_REGISTRY_CONTRACT_ADDRESS: ${MAINNET_WORKFLOW_REGISTRY_CONTRACT_ADDRESS:-}
+      TESTNET_WORKFLOW_REGISTRY_CONTRACT_ADDRESS: ${MAINNET_WORKFLOW_REGISTRY_CONTRACT_ADDRESS:-}
       MAINNET_WORKFLOW_REGISTRY_RPC_URL: ${MAINNET_WORKFLOW_REGISTRY_RPC_URL:-}
       TESTNET_WORKFLOW_REGISTRY_RPC_URL: ${MAINNET_WORKFLOW_REGISTRY_RPC_URL:-}
       MAINNET_WORKFLOW_REGISTRY_FINALITY_DEPTH: ${MAINNET_WORKFLOW_REGISTRY_FINALITY_DEPTH:-}