Add DNS over HTTPS support and environment variable configuration for pihole in helmfile.yaml

Enable DNS over HTTPS (DoH) and configure the DNSMASQ listening behavior to allow all interfaces. This update enhances the pihole service's DNS capabilities and flexibility in handling requests.

Author: max06

apps/pihole/helmfile.yaml

@@ -15,3 +15,7 @@ releases:
           mixedService: true
           annotations:
             "lbipam.cilium.io/ips": "192.168.30.241"
+        doh:
+          enabled: true
+        extraEnvVars:
+          DNSMASQ_LISTENING: all