Fixed erros in multiple CT's

Added fixes for: Pihole , aptcacher, OmdaV3, mailbackup  and nginx

CT-Build/Debian.yaml

@@ -1042,6 +1042,7 @@ packages:
     - collabora
     - jellyfin
     - pihole
+    - omadaV3
     - docker
     - smb
     - tvheadend
@@ -1194,6 +1195,13 @@ packages:
     variants:
     - domoticz
 
+#OmadaV3 pkgs    
+  - packages:
+    - curl
+    action: install
+    variants:
+    - omadaV3
+
 #docker pkgs    
   - packages:
     - docker-ce