Heroku rclone conf

[wahyd4]

Help with #168

Now users can inject rclone config into Heroku via base64 string. In order to get the base64 string:

1. run the app locally, and authenticate with the remote storage provider to have the final /app/conf/rclone.conf file
2. run cat /app/conf/rclone.conf | base64 or any base64 online tools such as this to generate base64 string
3. put base64 string as environment variable RCLONE_CONFIG_BASE64
4. and remember to add extra permission to the container given it needs to be mount /dev/fuse
   A working example of docker run command:

docker run -d -p 8080:80 -e ENABLE_RCLONE=true --cap-add SYS_ADMIN -e RCLONE_CONFIG_BASE64=<your base64 string> --device /dev/fuse wahyd4/aria2-ui