Added Pi-hole / cloudflared example for use of DoH

Signed-off-by: Leon Stoldt <tech@leon-stoldt.de>

pihole-cloudflared-DoH/docker-compose.yaml

@@ -0,0 +1,55 @@
+version: '3.7'
+services:
+  cloudflared:
+    image: visibilityspots/cloudflared
+    container_name: cloudflared
+    ports:
+      - "5054:5054/tcp"
+      - "5054:5054/udp"
+    environment:
+      - TZ=${TIMEZONE}
+      - PORT=5054
+      - ADDRESS=0.0.0.0
+    restart: always
+    networks:
+      dns-net:
+        ipv4_address: 172.20.0.2
+
+  pihole:
+    container_name: pihole
+    image: pihole/pihole:latest
+    ports:
+      - "53:53/tcp"
+      - "53:53/udp"
+      - "67:67/udp"
+      - "8080:80/tcp"
+      - "8443:443/tcp"
+    environment:
+      - TZ=${TIMEZONE}
+      - PIHOLE_DNS_=172.20.0.2#5054;1.1.1.1 # referencing by name results in "Invalid IP detected in PIHOLE_DNS_: cloudflared#5054"
+      - WEBPASSWORD=${PIHOLE_PW}
+      - REV_SERVER=true
+      - REV_SERVER_TARGET=${PIHOLE_ROUTER_IP}
+      - REV_SERVER_DOMAIN=${PIHOLE_NETWORK_DOMAIN}
+      - REV_SERVER_CIDR=${PIHOLE_REVERSE_DNS}
+      - ServerIP=${PIHOLE_HOST_IP}
+      - ServerIPv6=${PIHOLE_HOST_IPV6}
+    #dns:
+      #- 127.0.0.1 # "Sets your container's resolve settings to localhost so it can resolve DHCP hostnames [...]" - github.com/pi-hole/docker-pi-hole
+      #- 1.1.1.1 # Backup server
+    volumes: # store your data between container upgrades
+      - "/etc/pihole/:/etc/pihole/"
+      - "/etc/dnsmasq.d/:/etc/dnsmasq.d/"
+    cap_add:
+      - NET_ADMIN # Recommended but not required (DHCP needs NET_ADMIN) https://github.com/pi-hole/docker-pi-hole#note-on-capabilities
+    depends_on:
+      - "cloudflared"
+    restart: always
+    networks:
+      - dns-net
+
+networks:
+  dns-net:
+    ipam:
+      config:
+        - subnet: 172.20.0.0/24