Allow specifying additional patterns to back up

scripts/Common/Software/docker/services/service.fish

@@ -172,7 +172,17 @@ begin
         sudo systemctl restart nginx
     end
 
+    function getExtraBackupPatterns
+        echo ""
+    end
+
     function getBackupArgs
-        printf "%s\n" --base-directory (getServiceRoot $argv) --hidden --no-ignore "^(docker-compose\.secrets\.yml|data)\$"
+        set -l extraPatterns (getExtraBackupPatterns)
+
+        if [ -n "$extraPatterns" ]
+            set extraPatterns "|$extraPatterns"
+        end
+
+        printf "%s\n" --base-directory (getServiceRoot $argv) --hidden --no-ignore "^(docker-compose\.secrets\.yml|data)\$$extraPatterns"
     end
 end