migrate borgbackup to alpine

[szaimen]

Close part of #205

Signed-off-by: szaimen szaimen@e.mail.de

[szaimen]

@juliushaertl @max-nextcloud do you know if we might run into an issue with already existing instances here as we keep the root dir between container exchanges?

all-in-one/php/containers.json

Lines 206 to 210 in 853a880

	{
	"name": "nextcloud_aio_backup_cache",
	"location": "/root",
	"writeable": true
	},

[juliushaertl]

🐘

[szaimen]

Thanks!