made the mariadb example a bit more complete

README.md

@@ -42,10 +42,16 @@ Example for using the dockerfile on this repo.
 docker build -t sync .
 docker network create sync
 
-docker run --rm -d --name sync-db --network sync mariadb 
+docker run -d --name sync-db \
+-e MARIADB_ROOT_PASSWORD='abcdefg123456' \
+-e MARIADB_DATABASE=cytube \
+-e MARIADB_USER=cytube \
+-e MARIADB_PASSWORD=aaaaa \
+--network sync mariadb
 
 docker run -d --name sync-web \
 -e MYSQL_HOST=sync-db \
+-e MYSQL_PASSWORD=aaaaa \
 -e ROOT_URL=https://cytube.my.domain \
 -e IO_ROOT_URL=https://cytube.my.domain \
 -e ROOT_DOMAIN=cytube.my.domain \