volumes 

(OPTIONAL)
This is a definition of volumes. Using the variables you can set the path of the container as well as the size. The volume size have to be a multiple of 8 (8, 16, 24,..). If the Dockerfile of your image has volumes defined, we add them automatically for you.

Example:

volumes:
- path: "/var/lib/mysql"
  size: "8GB"

Learn more about volumes here.

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