Subscription my.nethserver.com cloud backup

[DavidePrincipi]

The Nethesis Enterprise plan already provides automated, daily upload of cluster configuration backup to my.nethesis.it.

Implement the automated upload also for my.nethserver.com.

Additional context

• Server implementation: https://github.com/nethesis/legacy_backupd?tab=readme-ov-file#api-version-2.
• Existing code for Enterprise https://github.com/NethServer/ns8-core/blob/bdb8f692c91060adb658112c94a79ba8e50c3cca/core/imageroot/var/lib/nethserver/cluster/bin/send-cluster-backup#L34

See also

• Discussion https://mattermost.nethesis.it/nethesis/pl/pktbdhhjztgodgwqbod8sks3jh
• Docs https://docs.nethserver.org/projects/ns8/en/latest/subscription.html#subscription
• NethSecurity script using API v2: https://github.com/NethServer/nethsecurity/blob/main/packages/ns-plug/files/remote-backup

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Thanks to @gsanchietti

[stephdl]

QA

target ghcr.io/nethserver/core:3.9.3-dev.4

test with an enterprise and an subscription key on a new ns8 core install

configure the backup, trigger a backup

• set an enterprise key, do :

runagent
/var/lib/nethserver/cluster/bin/send-cluster-backup

example of good output: {"result":"success"}Backup uploaded to provider nsent with hash 294564ec5b36120ce46eae64d491788a

• set a subscription key, do :

runagent
/var/lib/nethserver/cluster/bin/send-cluster-backup

example of good output: {"result":"success"}Backup uploaded to provider nscom with hash 294564ec5b36120ce46eae64d491788a

• without subscription or enterprise, do

runagent
/var/lib/nethserver/cluster/bin/send-cluster-backup

the provider does not exist
[ERROR] Unsupported provider: