[UPDATE] update sample.env to cover docker env variables

Author: mehdiirh

sample.env

@@ -1,4 +1,5 @@
 WEBSITE_ADDRESS=
+RUN_ON=
 SECRET_KEY=change-me
 DEBUG=False
 ALLOWED_HOSTS=
@@ -8,8 +9,14 @@ DB_PORT=
 DB_NAME=
 DB_USER=
 DB_PASS=
+DB_BIND_PORT=
+
+FLOWER_USERNAME=
+FLOWER_PASSWORD=
+FLOWER_BIND_PORT=
 
 CACHE_URL=redis://
+REDIS_BIND_PORT=
 
 LANGUAGE_CODE=en-US
 TIME_ZONE=Asia/Tehran