docs: log session outcomes and apply enhancements across multiple components

- **Docker Fixes:** Resolved failed builds for Gateway and Ping services by switching to `eclipse-temurin:21-jdk-alpine`, correcting Gradle configurations, and fixing cache mount paths.
- **ZNS-Import Consul Registration:** Enabled Consul service discovery by updating `application.yaml` and `build.gradle.kts`.
- **pgAdmin Provisioning:** Preconfigured the database server in `servers.json` and updated `dc-ops.yaml` for seamless setup.
- **Postman Documentation:** Added a detailed Postman test guide covering environment setup, endpoint groups, and recommended test sequences.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

backend/services/zns-import/zns-import-service/build.gradle.kts

@@ -20,6 +20,7 @@ dependencies {
   implementation(libs.spring.boot.starter.web)
   implementation(libs.spring.boot.starter.validation)
   implementation(libs.spring.boot.starter.actuator)
+  implementation(libs.spring.cloud.starter.consul.discovery)
 
   implementation(libs.exposed.core)
   implementation(libs.exposed.dao)

backend/services/zns-import/zns-import-service/src/main/resources/application.yaml

@@ -20,7 +20,17 @@ spring:
     exclude:
       - org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration
       - org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration
-
+  cloud:
+    consul:
+      host: ${SPRING_CLOUD_CONSUL_HOST:localhost}
+      port: ${SPRING_CLOUD_CONSUL_PORT:8500}
+      enabled: ${CONSUL_ENABLED:true}
+      discovery:
+        enabled: ${CONSUL_ENABLED:true}
+        register: ${CONSUL_ENABLED:true}
+        health-check-path: /actuator/health
+        health-check-interval: 10s
+        instance-id: ${spring.application.name}-${server.port}-${random.uuid}
 management:
   endpoints:
     web: