Merge pull request 'obs-portal: add backups' (#228) from obs-portal-backups into main

Reviewed-on: #228
Reviewed-by: b12f <b12f@noreply.git.pub.solar>
Reviewed-by: Hendrik Sokolowski <hensoko@noreply.git.pub.solar>

modules/obs-portal/default.nix

@@ -147,4 +147,26 @@ in
       };
     };
   };
+
+  pub-solar-os.backups.restic.obs-portal = {
+    paths = [
+      "/var/lib/obs-portal/data"
+      "/tmp/obs-portal-backup.sql"
+    ];
+    timerConfig = {
+      OnCalendar = "*-*-* 00:30:00 Etc/UTC";
+    };
+    initialize = true;
+    backupPrepareCommand = ''
+      ${pkgs.docker}/bin/docker exec -ti --user postgres obs-portal-db pg_dump obs > /tmp/obs-portal-backup.sql
+    '';
+    backupCleanupCommand = ''
+      rm /tmp/obs-portal-backup.sql
+    '';
+    pruneOpts = [
+      "--keep-daily 7"
+      "--keep-weekly 4"
+      "--keep-monthly 3"
+    ];
+  };
 }