Enable a list of success_codes for rclone return code

[dantebarba]

For some sync and copy options rclone does not return a "0" status code even if the option has a user-intended behavior. A modification needs to be made to the sync.sh script to treat some return codes as success codes.

• Sync.sh should be modified to support a list of success codes.
• An env var should be declared with "0" as default value.

[dantebarba]

ChatGPT solution:

https://chat.openai.com/share/2923bee5-8f62-4b75-9e5c-d23ae3cfc96b