Add podman container roles

roles/ikke_t.container_image_cleanup/README.md

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+Container Image Cleanup
+=======================
+
+Periodicly cleans up all unused container images from host. Role sets up cron
+job based on whether podman or docker is installed.
+
+Requirements
+------------
+
+Role checks if either Podman or Docker is installed on host before installing cronjob.
+
+Role Variables
+--------------
+
+There are variables in defaults/main.yml for timing of cronjob,
+as well as path to binaries for docker and podman to check for.
+
+
+* **podman_prune_cronjob_special_time**  
+  see special_time options https://docs.ansible.com/ansible/latest/modules/cron_module.html
+* **docker_prune_cronjob_special_time**  
+  see special_time options https://docs.ansible.com/ansible/latest/modules/cron_module.html
+* **podman_prune_opts**  
+  podman system prune options, e.g. "--all --force"
+* **docker_prune_opts:**  
+  docker image prune options, e.g. "--all --force"
+* **podman_path:**  
+  where to look for podman executable, e.g: /usr/bin/podman
+* **docker_path:**  
+  where to look for docker executable, e.g: /usr/bin/docker
+
+
+Dependencies
+------------
+
+No dependencies.
+
+Example Playbook
+----------------
+
+```
+- name: periodicly clean up unused containers
+  hosts: all
+  roles:
+    - role: container_image_cleanup
+      vars:
+        podman_prune_cronjob_special_time: daily
+        docker_prune_cronjob_special_time: weekly
+        podman_prune_opts: "--all --force"
+        docker_prune_opts: "--all --force"
+        podman_path: /usr/bin/podman
+        docker_path: /usr/bin/docker
+```
+
+License
+-------
+
+GPLv3
+
+Author Information
+------------------
+
+Ilkka Tengvall, ilkka.tengvall@iki.fi