feat(ansible): add semaphore docker splash demo with dagster config

ansible-semaphore-docker-demo/semaphore_dagster_config.example.yml

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+# Configuration for SemaphoreUI + Ansible Docker Splash Demo
+# Aggiorna i campi in base al tuo ambiente
+
+# SemaphoreUI connection settings
+semaphore_url: "https://your-semaphore-instance.com"
+semaphore_token: "your-semaphore-api-token"
+project_id: 1
+
+# Git repository configuration
+git_provider: "gitea"  # github, gitlab, gitea, ...
+git_base_url: "https://your-gitea-instance.com"
+git_repo_url: "https://your-gitea-instance.com/your-user/ansible-semaphore-docker-demo.git"
+git_branch: "main"
+
+# Git authentication (optional for private repos)
+git_username: "your-username"
+git_access_token: "your-personal-access-token"
+
+# Environment configuration
+environment_name: "Semaphore Docker Splash Environment"
+environment_variables:
+  nginx_image: "nginx"
+  nginx_version: "1.27-alpine"
+  container_name: "semaphore-splash"
+
+  app_port: "8090"
+  app_environment: "production"
+  greeting_message: "Ciao dal deploy SemaphoreUI"
+
+  accent_color: "#0ea5a4"
+  secondary_color: "#f97316"
+
+  remove_image: "false"
+
+  nginx_worker_processes: "auto"
+  nginx_worker_connections: "1024"
+
+# Optional encrypted secrets in SemaphoreUI Environment
+secrets:
+  app_secret: "demo-secret-from-semaphore"
+  release_id: "v1-test"
+  demo_api_key: "demo-api-key-123"
+  demo_db_password: "demo-db-pass-123"
+
+# Inventory configuration
+inventory_name: "Docker Splash Servers"
+inventory_type: "static"
+inventory_content: |
+  [webservers]
+  server1 ansible_host=XXX.XXX.XXX.XXX ansible_user=root
+
+  [webservers:vars]
+  ansible_python_interpreter=/usr/bin/python3
+
+  [all:vars]
+  ansible_connection=ssh
+
+# Ansible Vault configuration
+# Se non usi file vault, puo restare vuoto
+vault_password: ""
+
+# Playbooks configuration
+playbooks:
+  - name: "Test Connectivity"
+    description: "Check host reachability and Docker prerequisites"
+    playbook_filename: "test.yml"
+
+  - name: "Deploy Splash App"
+    description: "Deploy Nginx container with custom splash page"
+    playbook_filename: "deploy.yml"
+
+  - name: "Undeploy Splash App"
+    description: "Remove container and clean up resources"
+    playbook_filename: "undeploy.yml"
+
+# Optional additional settings
+timeout_seconds: 30
+enable_health_check: true