flux: add backups

deploy/backups/.env.d/.gitignore

@@ -1,3 +0,0 @@
-**
-!.gitignore
-!*.example

deploy/backups/.env.d/borg_key.example

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-BORG_KEY an valid borg key

deploy/backups/.env.d/id_rsa.example

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------BEGIN OPENSSH PRIVATE KEY-----
-AND VALID PRIVATE SSH KEY WITH ACCESS TO SSH SERVER  
------END OPENSSH PRIVATE KEY-----

deploy/backups/.env.d/secrets.example

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-PBS_REPOSITORY=xxx@pbs@server_address:collection
-PBS_PASSWORD=pbs access password
-PBS_FINGERPRINT=00:00:00:00:00 # pbs server fingerprint
-BORG_REPO="ssh://user@server/path" # required by offsite backup
-BORG_PASSPHRASE="borg passphrase" # required by offsite backup
-OFFSITE_TARGET_FOLDER="test:target_path" # follow rclone naming convention
-