feat: add blackbox monitoring and app3 deployment

- Add blackbox exporter role and playbooks
- Add cadvisor, docker, httpbin roles
- Add app3 deployment playbooks
- Configure blackbox monitoring

roles/cadvisor/tasks/main.yml

@@ -0,0 +1,51 @@
+---
+- name: Ensure cAdvisor container is running
+  community.docker.docker_container:
+    name: "{{ cadvisor_container_name }}"
+    image: "{{ cadvisor_image }}"
+    state: started
+    restart_policy: unless-stopped
+    ports:
+      - "{{ cadvisor_port }}:8080"
+    volumes:
+      - "/:/rootfs:ro"
+      - "/var/run:/var/run:ro"
+      - "/sys:/sys:ro"
+      - "/var/lib/docker/:/var/lib/docker:ro"
+      - "/dev/disk/:/dev/disk:ro"
+    privileged: true
+    devices:
+      - "/dev/kmsg:/dev/kmsg"
+  tags: cadvisor
+
+- name: Configure UFW for cAdvisor
+  ufw:
+    rule: allow
+    port: "{{ cadvisor_port }}"
+    proto: tcp
+    comment: "cAdvisor metrics"
+  tags: cadvisor
+
+- name: Wait for cAdvisor to be ready
+  wait_for:
+    port: "{{ cadvisor_port }}"
+    host: "{{ ansible_host }}"
+    delay: 2
+    timeout: 60
+  tags: cadvisor
+
+- name: Verify cAdvisor is accessible
+  uri:
+    url: "http://{{ ansible_host }}:{{ cadvisor_port }}/metrics"
+    return_content: true
+    status_code: 200
+  register: cadvisor_check
+  until: cadvisor_check.status == 200
+  retries: 5
+  delay: 3
+  tags: cadvisor
+
+- name: Show cAdvisor status
+  debug:
+    msg: "cAdvisor successfully deployed at http://{{ ansible_host }}:{{ cadvisor_port }}/metrics"
+  tags: cadvisor