Add crun support (#6864)

Signed-off-by: Victor Morales <v.morales@samsung.com>

roles/container-engine/cri-o/defaults/main.yml

@@ -54,6 +54,13 @@ kata_runtimes:
     type: oci
     root: /run/kata-containers
 
+# crun is a fast and low-memory footprint OCI Container Runtime fully written in C.
+crun_runtime:
+  name: crun
+  path: /usr/bin/crun
+  type: oci
+  root: /run/crun
+
 # When this is true, CRI-O package repositories are added. Set this to false when using an
 # environment with preconfigured CRI-O package repositories.
 crio_add_repos: true

roles/container-engine/cri-o/tasks/main.yaml

@@ -45,12 +45,18 @@
 
 - import_tasks: "crictl.yml"
 
-- name: Build a list of crio runtimes
+- name: Build a list of crio runtimes with Katacontainers runtimes
   set_fact:
     crio_runtimes: "{{ crio_runtimes + kata_runtimes  }}"
   when:
     - kata_containers_enabled
 
+- name: Build a list of crio runtimes with crun runtime
+  set_fact:
+    crio_runtimes: "{{ crio_runtimes + [crun_runtime] }}"
+  when:
+    - crun_enabled
+
 - name: Make sure needed folders exist in the system
   with_items:
     - /etc/crio