cfddns: rebuild on private fork with management web UI

- Swap image from favonia/cloudflare-ddns:latest to
  git.alexzaw.dev/alexz/cloudflare-ddns:latest (private fork with
  cmd/manager binary that wraps the original ddns updater)
- Expose web UI on internal port 8080, traefik-routable
- Add CFDDNS_WEB_USER/CFDDNS_WEB_PASSWORD basic-auth form fields
- Repurpose existing DOMAINS/PROXIED/UPDATE_CRON/TZ as first-run seed
  for the YAML config that the UI manages thereafter
- Mount ${APP_DATA_DIR}/data:/config for persistent cfddns.yaml
- Healthcheck on /healthz via 127.0.0.1 (alpine wget)
- Bump tipi_version 7 -> 8 to trigger app update

apps/cfddns/docker-compose.yml

@@ -1,13 +1,26 @@
 services:
   cfddns:
-    image: 'favonia/cloudflare-ddns:latest'
+    image: 'git.alexzaw.dev/alexz/cloudflare-ddns:latest'
     environment:
+      - 'CFDDNS_LISTEN=:8080'
+      - 'CFDDNS_CONFIG_FILE=/config/cfddns.yaml'
+      - 'CFDDNS_WEB_USER=${CFDDNS_WEB_USER}'
+      - 'CFDDNS_WEB_PASSWORD=${CFDDNS_WEB_PASSWORD}'
       - 'CLOUDFLARE_API_TOKEN=${CLOUDFLARE_API_TOKEN}'
-      - 'DOMAINS=${DOMAINS}'
+      - 'DOMAINS=${DOMAINS:-}'
       - 'PROXIED=${PROXIED:-false}'
       - 'UPDATE_CRON=${UPDATE_CRON:-@every 5m}'
       - 'TZ=${TZ:-UTC}'
+    volumes:
+      - '${APP_DATA_DIR}/data:/config'
+    healthcheck:
+      test: ['CMD-SHELL', 'wget --spider -q http://127.0.0.1:8080/healthz || exit 1']
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
     x-runtipi:
       is_main: true
+      internal_port: 8080
 x-runtipi:
   schema_version: 2