chore: add CoreDNS configuration and service to Docker Compose

- Introduce a new Corefile for custom DNS records and caching.
- Add CoreDNS service to the Docker Compose configuration with appropriate ports and volume mapping.
- Enable logging and upstream DNS forwarding for enhanced DNS resolution.

Author: theboringhumane

server/Corefile

@@ -0,0 +1,18 @@
+.:53 {
+    # Custom records
+    hosts {
+        172.30.0.10 port.tcp.go
+        fallthrough
+    }
+    
+    # Forward everything else to upstream DNS
+    forward . 8.8.8.8 1.1.1.1
+    
+    # Enable logging
+    log
+    
+    # Enable caching
+    cache 30
+    
+    errors
+}

server/docker-compose-tailscale.yml

@@ -53,6 +53,16 @@ services:
     sysctls:                          # ADD THIS
       - net.ipv4.ip_forward=1        # Enable IP forwarding
       - net.ipv6.conf.all.forwarding=1
+  
+  coredns:
+    image: coredns/coredns:latest
+    container_name: custom-dns
+    ports:
+      - "53:53/udp"
+      - "53:53/tcp"
+    volumes:
+      - ./Corefile:/Corefile
+    restart: unless-stopped
 
 networks:
   rabbit-net: