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/httpbin/tasks/main.yml

@@ -0,0 +1,42 @@
+---
+- name: Ensure httpbin container is running
+  community.docker.docker_container:
+    name: "{{ httpbin_container_name }}"
+    image: "{{ httpbin_image }}"
+    state: started
+    restart_policy: unless-stopped
+    ports:
+      - "{{ httpbin_port }}:80"
+  tags: httpbin
+
+- name: Configure UFW for httpbin
+  ufw:
+    rule: allow
+    port: "{{ httpbin_port }}"
+    proto: tcp
+    comment: "httpbin API"
+  tags: httpbin
+
+- name: Wait for httpbin to be ready
+  wait_for:
+    port: "{{ httpbin_port }}"
+    host: "{{ ansible_host }}"
+    delay: 2
+    timeout: 60
+  tags: httpbin
+
+- name: Verify httpbin is accessible
+  uri:
+    url: "http://{{ ansible_host }}:{{ httpbin_port }}/get"
+    return_content: true
+    status_code: 200
+  register: httpbin_check
+  until: httpbin_check.status == 200
+  retries: 5
+  delay: 3
+  tags: httpbin
+
+- name: Show httpbin status
+  debug:
+    msg: "httpbin successfully deployed at http://{{ ansible_host }}:{{ httpbin_port }}/"
+  tags: httpbin