Add an upload bundle option with the flag --upload-bundle; by default, the upload will use a NetBird address, which can be replaced using the flag --upload-bundle-url.
The upload server is available under the /upload-server path. The release change will push a docker image to netbirdio/upload image repository.
The server supports using s3 with pre-signed URL for direct upload and local file for storing bundles.
Adds the following to the debug bundle:
- iptables: `iptables-save`, `iptables -v -n -L`
- nftables: `nft list ruleset` or if not available formatted output from netlink (WIP)
