mysql:
    image: mysql
    restart: always
    mem_limit: 2147483648
    ports:
        - "3306:3306"
    environment:
        - MYSQL_RANDOM_ROOT_PASSWORD=true
        - MYSQL_USER=airflow
        - MYSQL_PASSWORD=airflow
        - MYSQL_DATABASE=airflow

webserver:
    links:
        - mysql:mysql

scheduler:
    links:
        - mysql:mysql

worker:
    links:
        - mysql:mysql

mysql:
    image: mysql
    restart: always
    mem_limit: 2147483648
    ports:
        - "3306:3306"
    environment:
        - MYSQL_RANDOM_ROOT_PASSWORD=true
        - MYSQL_USER=airflow
        - MYSQL_PASSWORD=airflow
        - MYSQL_DATABASE=airflow

webserver:
    links:
        - mysql:mysql

scheduler:
    links:
        - mysql:mysql

worker:
    links:
        - mysql:mysql

flower:
    links:
        - mysql:mysql

Add flower<->mysql link for local dev.
Add flower<->mysql link for local dev.

The flower container previously failed waiting for mysql, but since
it didn't have the "links" established, that never worked. Should
have no effect when deploying on AWS, since it uses RDS.
