refactor(molecule): use docker instead of podman

The scenario now starts its containers with community.docker instead of containers.podman, because docker is the
container runtime available on the CI runner. The connection plugin, the login command and the declared collections
were adjusted accordingly and the docker SDK for python is installed in the workflow, since the module requires it.

Co-authored-by: Copilot <copilot@github.com>

molecule/default/create.yml

@@ -5,7 +5,7 @@
   gather_facts: false
   tasks:
   - name: Start a container per platform
-    containers.podman.podman_container:
+    community.docker.docker_container:
       name: "{{ item.name }}"
       image: "{{ item.image }}"
       command: "sleep infinity"
@@ -19,7 +19,7 @@
       content: |
         {% for platform in molecule_yml.platforms %}
         - instance: {{ platform.name }}
-          connection: containers.podman.podman
+          connection: community.docker.docker
         {% endfor %}
       dest: "{{ molecule_instance_config }}"
       mode: "0600"