fix(signoz): fix ClickHouse hostname resolution and IPv6 binding

- Override the ClickHouse image's config.d/docker_related_config.xml,
  which listens on the IPv6 wildcard address ([::]) first and fails to
  bind on hosts without IPv6 support; listen on 0.0.0.0 (IPv4) only and
  disable the internal DNS cache so transient startup DNS failures for
  zookeeper-1/clickhouse are not cached (issue #534).
- Set hostname: clickhouse (instead of container_name) so the server
  identifies itself as the cluster host declared in cluster.xml.
- Remove the explicit signoz-net network: Dokploy attaches its own
  networks automatically and the repo validator rejects explicit
  networks; a fixed-name shared network also breaks service DNS across
  deployments.
- Fix mount mismatch: template.toml created files/signoz/prometheus.xml
  while the compose mounts ../files/signoz/prometheus.yml, so Docker
  silently mounted a directory as the signoz prometheus config.
- Give the otel-collector domain its own generated host: both domains
  previously shared the same host and path "/", creating two conflicting
  Traefik routers where one service randomly won.

Closes #534

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

blueprints/signoz/docker-compose.yml

@@ -1,6 +1,4 @@
 x-common: &common
-  networks:
-    - signoz-net
   restart: unless-stopped
   logging:
     options:
@@ -89,11 +87,12 @@ services:
       - ZOO_PROMETHEUS_METRICS_PORT_NUMBER=9141
   clickhouse:
     !!merge <<: *clickhouse-defaults
-    container_name: signoz-clickhouse
+    hostname: clickhouse
     volumes:
       - ../files/clickhouse/config.xml:/etc/clickhouse-server/config.xml
       - ../files/clickhouse/user_scripts:/var/lib/clickhouse/user_scripts/
       - ../files/clickhouse/cluster.xml:/etc/clickhouse-server/config.d/cluster.xml
+      - ../files/clickhouse/docker_related_config.xml:/etc/clickhouse-server/config.d/docker_related_config.xml
       - clickhouse:/var/lib/clickhouse/
   signoz:
     !!merge <<: *db-depend
@@ -156,9 +155,6 @@ services:
       - --dsn=tcp://clickhouse:9000
       - --up=
     restart: on-failure
-networks:
-  signoz-net:
-    name: signoz-net
 volumes:
   clickhouse:
     name: signoz-clickhouse

blueprints/signoz/template.toml

@@ -1,5 +1,6 @@
 [variables]
 main_domain = "${domain}"
+otel_domain = "${domain}"
 jwt_secret = "${password:64}"
 
 [config]
@@ -12,7 +13,7 @@ path = "/"
 [[config.domains]]
 serviceName = "otel-collector"
 port = 4318
-host = "${main_domain}"
+host = "${otel_domain}"
 path = "/"
 
 [config.env]
@@ -1246,7 +1247,23 @@ content = """
 """
 
 [[config.mounts]]
-filePath = "/signoz/prometheus.xml"
+filePath = "/clickhouse/docker_related_config.xml"
+content = """
+<?xml version="1.0"?>
+<clickhouse>
+    <!-- Overrides the docker image's default config.d/docker_related_config.xml,
+         which listens on the IPv6 wildcard address ([::]) first. On hosts without
+         IPv6 support the bind fails, so listen on IPv4 only. -->
+    <listen_host>0.0.0.0</listen_host>
+    <listen_try>1</listen_try>
+    <!-- Container IPs can change and DNS records (zookeeper-1, clickhouse) may not
+         be ready the moment ClickHouse starts. Do not cache DNS lookup failures. -->
+    <disable_internal_dns_cache>1</disable_internal_dns_cache>
+</clickhouse>
+"""
+
+[[config.mounts]]
+filePath = "/signoz/prometheus.yml"
 content = """
 # my global config
 global: