Refactor: Organize Ansible project structure

- Reorganized Ansible project structure to follow best practices.
- Created dedicated directories: , , , , and .
- Categorized playbooks into  (host-specific) and  (service-specific).
- Moved all roles into the  directory and standardized their naming conventions.
- Relocated  to  for better variable management.
- Renamed  to  to reflect its global variable scope.
- Created  to correctly set the  to the new  directory.
- Moved  and  into the  directory.
- Added  to  providing explanations for common commands.
- Cleaned up  directories from all individual roles to centralize version control.

roles/docker/tasks/setup-RedHat.yml

@@ -0,0 +1,52 @@
+---
+- name: Ensure old versions of Docker are not installed.
+  package:
+    name:
+      - docker
+      - docker-common
+      - docker-engine
+    state: absent
+
+- name: Add Docker GPG key.
+  rpm_key:
+    key: "{{ docker_yum_gpg_key }}"
+    state: present
+
+- name: Add Docker repository.
+  get_url:
+    url: "{{ docker_yum_repo_url }}"
+    dest: '/etc/yum.repos.d/docker-{{ docker_edition }}.repo'
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Configure Docker Nightly repo.
+  ini_file:
+    dest: '/etc/yum.repos.d/docker-{{ docker_edition }}.repo'
+    section: 'docker-{{ docker_edition }}-nightly'
+    option: enabled
+    value: '{{ docker_yum_repo_enable_nightly }}'
+    mode: 0644
+    no_extra_spaces: true
+
+- name: Configure Docker Test repo.
+  ini_file:
+    dest: '/etc/yum.repos.d/docker-{{ docker_edition }}.repo'
+    section: 'docker-{{ docker_edition }}-test'
+    option: enabled
+    value: '{{ docker_yum_repo_enable_test }}'
+    mode: 0644
+    no_extra_spaces: true
+
+- name: Configure containerd on RHEL 8.
+  block:
+    - name: Ensure container-selinux is installed.
+      package:
+        name: container-selinux
+        state: present
+
+    - name: Ensure containerd.io is installed.
+      package:
+        name: containerd.io
+        state: present
+  when: ansible_distribution_major_version | int == 8