add example playbooks for testing against local docker container

ansible/debian.dockerfile

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+FROM debian:10
+
+RUN apt update && apt install -y init sudo python

ansible/test_docker.yml

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+---
+- hosts: localhost
+  connection: local
+  gather_facts: False
+
+  tasks:
+    - name: add container to inventory
+      add_host:
+        name: debian
+        ansible_connection: docker
+      changed_when: false
+
+    - name: test my debian role
+      include_role:
+        name: deb
+        apply:
+          delegate_to: debian

ansible/test_inventory.ini

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+[testing]
+debian ansible_connection=docker 
+

ansible/test_roles.yml

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+---
+- hosts: debian
+  gather_facts: True
+
+  roles:
+    - deb