container: Move secrets to its own tasks file

roles/container/tasks/secrets.yaml

@@ -0,0 +1,8 @@
+---
+- name: Create secrets for container {{ container_name }}
+  containers.podman.podman_secret:
+    name: "{{ item.name }}"
+    data: "{{ item.value | default(lookup('community.general.random_string', special=false, length=128)) }}"
+    skip_existing: "{{ item.value is not defined }}"
+  no_log: true
+  loop: "{{ container_secrets }}"