feat(cloudflare-ddns): add cloudflare-ddns stack

compose/cloudflare-ddns/.env.example

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+UID="1000"
+GID="1000"
+CLOUDFLARE_API_TOKEN="CLOUDFLARE_API_KEY_HERE"
+DOMAINS="domain1.com,domain2.net" # Comma saperated domains to update the IP
+PROXIED="false" # Enables Cloudflare proxying
+IP6_PROVIDER="none"

compose/cloudflare-ddns/docker-compose.yml

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+services:
+  cloudflare-ddns:
+    image: favonia/cloudflare-ddns:latest
+    container_name: cloudflare-ddns
+    network_mode: host # This bypasses network isolation and makes IPv6 easier (optional; see below)
+    restart: unless-stopped
+    user: "${UID:-1000}:${GID:-1000}" # Run the updater with specific user and group IDs (in that order).
+    read_only: true # Make the container filesystem read-only (optional but recommended)
+    cap_drop: [all] # Drop all Linux capabilities (optional but recommended)
+    security_opt: [no-new-privileges:true] # Another protection to restrict superuser privileges (optional but recommended)
+    environment:
+      CLOUDFLARE_API_TOKEN: "${CLOUDFLARE_API_TOKEN:?}"
+      DOMAINS: "${DOMAINS:?}"
+      PROXIED: "${PROXIED:-false}"
+      IP6_PROVIDER: "${IP6_PROVIDER:-none}"