Merge pull request #1969 from kleo/patch-1

Borg backup provide ssh key example format

docs/configuring-playbook-backup-borg.md

@@ -43,7 +43,13 @@ matrix_backup_borg_location_repositories:
  - USER@HOST:REPO
 matrix_backup_borg_storage_encryption_passphrase: "PASSPHRASE"
 matrix_backup_borg_ssh_key_private: |
-	PRIVATE KEY
+  -----BEGIN OPENSSH PRIVATE KEY-----
+  TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQsIGNvbnNlY3RldHVyIGFkaXBpc2NpbmcgZW
+  xpdCwgc2VkIGRvIGVpdXNtb2QgdGVtcG9yIGluY2lkaWR1bnQgdXQgbGFib3JlIGV0IGRv
+  bG9yZSBtYWduYSBhbGlxdWEuIFV0IGVuaW0gYWQgbWluaW0gdmVuaWFtLCBxdWlzIG5vc3
+  RydWQgZXhlcmNpdGF0aW9uIHVsbGFtY28gbGFib3JpcyBuaXNpIHV0IGFsaXF1aXAgZXgg
+  ZWEgY29tbW9kbyBjb25zZXF1YXQuIA==
+  -----END OPENSSH PRIVATE KEY-----
 ```
 
 where:
@@ -52,7 +58,7 @@ where:
 * HOST - SSH host of a provider/server
 * REPO - borg repository name, it will be initialized on backup start, eg: `matrix`
 * PASSPHRASE - passphrase used for encrypting backups, you may generate it with `pwgen -s 64 1` or use any password manager
-* PRIVATE KEY - the content of the **private** part of the SSH key you created before
+* PRIVATE KEY - the content of the **private** part of the SSH key you created before. The whole key (all of its belonging lines) under `matrix_backup_borg_ssh_key_private` needs to be indented with 2 spaces
 
 To backup without encryption, add `matrix_backup_borg_encryption: 'none'` to your vars. This will also enable the `matrix_backup_borg_unknown_unencrypted_repo_access_is_ok` variable.