Fix container DNS resolution by expanding loopback access control

Co-authored-by: klutchell <20458272+klutchell@users.noreply.github.com>

Author: Copilot

rootfs_overlay/etc/unbound/unbound.conf

@@ -105,7 +105,7 @@ server:
 
     # The netblock is given as an IP4 or IP6 address with /size appended for a
     # classless network block. The action can be deny, refuse, allow or allow_snoop.
-    access-control: 127.0.0.1/32 allow
+    access-control: 127.0.0.0/8 allow
     access-control: 192.168.0.0/16 allow
     access-control: 172.16.0.0/12 allow
     access-control: 10.0.0.0/8 allow