fix: update lab05 docs and ansible validation

Author: pepegx

.gitignore

@@ -1,2 +1,9 @@
 test
-.DS_Store
+.DS_Store
+
+# Ansible
+*.retry
+.vault_pass
+ansible/.vault_pass
+ansible/inventory/*.pyc
+__pycache__/

ansible/ansible.cfg

@@ -0,0 +1,14 @@
+[defaults]
+inventory = inventory/hosts.ini
+roles_path = roles
+host_key_checking = False
+remote_user = ubuntu
+retry_files_enabled = False
+interpreter_python = auto_silent
+# Optional: uncomment if you use a local vault password file (do not commit it)
+# vault_password_file = .vault_pass
+
+[privilege_escalation]
+become = True
+become_method = sudo
+become_user = root

ansible/collections/requirements.yml

@@ -0,0 +1,8 @@
+---
+# Main lab requirements (installable from Galaxy in this environment).
+# Yandex Cloud dynamic inventory is handled separately via a plugin fallback
+# (see docs and `inventory/yandex_cloud_inventory.yml`) because `yandex.cloud`
+# is not currently published on Galaxy here.
+collections:
+  - name: community.general
+  - name: community.docker