Enable ControlNet mounts for AUTOMATIC1111 (#385)
The ControlNet addon
[sd-webui-controlnet](https://github.com/Mikubill/sd-webui-controlnet)
requires the `data/ControlNet` folder to be mounted into
`models/ControlNet`.
This PR enables said mount and adds the ControlNet folder to
`.gitignore` file.
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Co-authored-by: AbdBarho <ka70911@gmail.com>