cleanup and descritive README

ansible/roles/docker_ce_install/files/daemon.json

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+{
+    "default-runtime": "nvidia",
+    "runtimes": {
+      "nvidia": {
+        "args": [],
+        "path": "nvidia-container-runtime"
+      }
+    }
+  }

ansible/roles/docker_ce_install/tasks/main.yml

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+---
+- name: Install docker dependencies
+  ansible.builtin.apt:
+    pkg:
+      - apt-transport-https
+      - ca-certificates
+      - curl
+      - gnupg-agent
+      - software-properties-common
+      - python3-docker
+    update_cache: true
+
+- name: Prepare keyrings directory
+  ansible.builtin.file:
+    path: /etc/apt/keyrings
+    state: directory
+    mode: '0755'
+
+- name: Add Docker and Nvidia GPG apt Key
+  block:
+    - name: Get keys via download
+      ansible.builtin.get_url:
+        url: "{{ item.url }}"
+        dest: /etc/apt/keyrings/{{ item.keyfile }}
+        mode: "a+r"
+      with_items:
+        - { url: https://download.docker.com/linux/ubuntu/gpg, keyfile: "docker.asc"}
+    - name: Add keys to apt key
+      ansible.builtin.apt_key:
+        url: "{{ item }}"
+        state: present
+        keyring:
+      with_items:
+        - https://download.docker.com/linux/ubuntu/gpg
+        - https://nvidia.github.io/libnvidia-container/gpgkey
+    - name: Add repos
+      ansible.builtin.apt_repository:
+        repo: "deb {{ item.repo }}"
+        state: present
+      with_items:
+        - repo: "[arch=amd64 signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu {{ ansible_facts['distribution_release'] }} stable"
+        - repo: "https://nvidia.github.io/libnvidia-container/stable/deb/amd64 /"
+
+- name: Install docker
+  ansible.builtin.apt:
+    name: "{{ item }}"
+    state: present
+    update_cache: true
+  with_items:
+    - docker-ce
+    - docker-ce-cli
+    - containerd.io
+    - docker-buildx-plugin
+    - nvidia-container-toolkit
+
+- name: Configure nvidia-container-toolkit
+  ansible.builtin.command:
+    cmd: nvidia-ctk runtime configure --runtime=docker
+  register: nvidia_container_toolkit_configure
+
+- name: Start and enable docker-rootful service
+  ansible.builtin.systemd:
+    name: "{{ item }}"
+    state: restarted
+    enabled: true
+  with_items:
+    - docker.service
+    - docker.socket
+
+- name: Deploy daemon.json
+  ansible.builtin.copy:
+    src: daemon.json
+    dest: /etc/docker/daemon.json
+    mode: '0644'
+
+- name: Check nvidia-container-toolkit deployment
+  block:
+  - name: Deploy nvidia test containe
+    ansible.builtin.shell:
+      cmd: "sudo docker run --rm --runtime=nvidia --gpus all nvidia/cuda:11.6.2-base-ubuntu20.04 nvidia-smi"
+    register: nvidia_container_toolkit_configure
+  - name: Print result of nvidia-ctk runtime configure --runtime=docker
+    ansible.builtin.debug:
+      msg: "{{ nvidia_container_toolkit_configure }}"
+
+- name: Prepare docker group
+  ansible.builtin.user:
+    name: "{{ item }}"
+    group: docker
+    append: true
+    state: present
+  with_items:
+    - blurringtool
+
+- name: Start and enable docker-rootful service
+  ansible.builtin.systemd:
+    name: "{{ item }}"
+    state: started
+    enabled: true
+  with_items:
+    - docker.service
+    - docker.socket