tests/azure: Install community.docker Ansible collection

The test preparation failed with "the connection plugin
'community.docker.docker' was not found" in "Setup test container".

"ansible-galaxy collection install community.docker" has been added
to

  tests/azure/templates/playbook_tests.yml and
  tests/azure/templates/pytest_tests.yml

tests/azure/templates/playbook_tests.yml

@@ -34,6 +34,9 @@ jobs:
         "ansible${{ parameters.ansible_version }}"
     displayName: Install molecule and Ansible
 
+  - script: |
+      ansible-galaxy collection install community.docker
+
   - script: pip install -r requirements-tests.txt
     displayName: Install dependencies
 

tests/azure/templates/pytest_tests.yml

@@ -26,6 +26,9 @@ jobs:
         "ansible${{ parameters.ansible_version }}"
     displayName: Install molecule and Ansible
 
+  - script: |
+      ansible-galaxy collection install community.docker
+
   - script: pip install -r requirements-tests.txt
     displayName: Install dependencies