fix: env binding in oneshot and less output from dummy

docker/alpine/etc/wingmate/crontab.d/cron1.sh

@@ -3,4 +3,7 @@
 export WINGMATE_DUMMY_PATH=/usr/local/bin/wmdummy
 export WINGMATE_LOG=/var/log/cron1.log
 export WINGMATE_LOG_MESSAGE="cron executed in minute 5,10,15,20,25,30,35,40,45,50,55"
+
+echo "I'm runnig with dummy=$WINGMATE_DUMMY_PATH, log=$WINGMATE_LOG and mesage=$WINGMATE_LOG_MESSAGE" >> /var/log/debug-cron.log
+
 exec /usr/local/bin/wmoneshot