Initialize ansible and docker web stuff

ansible/roles/docker/README.md

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+# docker
+
+Installs the Docker repositories and packages as described in [the Docker documentation](https://docs.docker.com/engine/install/debian/#install-using-the-repository).
+Currently only works for Ubuntu since ubuntu is hardcoded into the `.list` file.

ansible/roles/docker/tasks/main.yaml

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+---
+- name: Install Docker installation prerequisites
+  become: yes
+  apt:
+    update_cache: yes
+    state: latest
+    name:
+      - ca-certificates
+      - curl
+      - gnupg
+      - lsb-release
+
+- name: Add Docker GPG key
+  become: yes
+  shell: "curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg"
+  args:
+    creates: /usr/share/keyrings/docker-archive-keyring.gpg
+
+- name: Retrieve dpkg architecture
+  shell: dpkg --print-architecture
+  register: dpkg_architecture
+  changed_when: False
+
+- name: Add Docker apt repository
+  become: yes
+  template:
+    src: docker.list.j2
+    dest: /etc/apt/sources.list.d/docker.list
+
+- name: Install Docker
+  become: yes
+  apt:
+    update_cache: yes
+    state: latest
+    name:
+    - docker-ce
+    - docker-ce-cli
+    - containerd.io

ansible/roles/docker/templates/docker.list.j2

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+deb [arch={{ dpkg_architecture.stdout }} signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable