add apt_repository role

roles/apt_repository/molecule/default/verify.yml

@@ -0,0 +1,21 @@
+---
+- name: Verify
+  hosts: all
+  gather_facts: true
+  tasks:
+    - name: Get content of docker source file
+      ansible.builtin.slurp:
+        src: /etc/apt/sources.list.d/docker.list
+      register: docker_repo
+
+    - name: Ensure docker repo file content is as expected
+      ansible.builtin.assert:
+        that: >
+          docker_repo.content | b64decode == "deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.asc]
+          https://download.docker.com/linux/{{ ansible_distribution | lower }}
+          {{ ansible_distribution_release }} stable\n"
+        msg: >
+          /etc/apt/sources.list.d/docker.list should contain
+          deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.asc]
+          https://download.docker.com/linux/{{ ansible_distribution | lower }}
+          {{ ansible_distribution_release }} stable but it contained {{ docker_repo.content | b64decode }} instead