example file: ``` DRONE_SSH_PREV_COMMAND_EXIT_CODE=0 ; if [ 0 -ne 0 ]; then exit 0; fi; version: '3.5' DRONE_SSH_PREV_COMMAND_EXIT_CODE=0 ; if [ 0 -ne 0 ]; then exit 0; fi; services: DRONE_SSH_PREV_COMMAND_EXIT_CODE=0 ; if [ 0 -ne 0 ]; then exit 0; fi; serve: ... ```