Add parsing external inventory file and add host

Sometimes, the VMs on which action would be done are not available when the
main Ansible playbook is executed. In that case, to parse the new inventory file
use `inventory_file.yml` task, then you would be able to use delegation to
execute tasks on new host.

Signed-off-by: Daniel Pawlik <dpawlik@redhat.com>

Author: danpawlik

roles/cifmw_helpers/README.md

@@ -190,3 +190,22 @@ To parse them and set as a fact, use `various_vars.yml` task file.
           "Value for file is: {{ cifmw_repo_setup_os_release }}"
           "Value for dict is: {{ test }}"
 ```
+
+#### Parse inventory file and add it to inventory
+
+Sometimes, the VMs on which action would be done are not available when the
+main Ansible playbook is executed. In that case, to parse the new inventory file
+use `inventory_file.yml` task, then you would be able to use delegation to
+execute tasks on new host.
+
+```yaml
+- name: Test parsing additional inventory file
+  hosts: localhost
+  tasks:
+    - name: Read inventory file and add it using add_host module
+      vars:
+        include_inventory_file: vms-inventory.yml
+      ansible.builtin.include_role:
+        name: cifmw_helpers
+        tasks_from: inventory_file.yml
+```

roles/cifmw_helpers/tasks/inventory_file.yml

@@ -0,0 +1,16 @@
+---
+- name: Read inventory file
+  ansible.builtin.slurp:
+    src: "{{ include_inventory_file }}"
+  register: _inventory_file
+
+- name: Parse inventory file content
+  ansible.builtin.set_fact:
+    inventory_data: "{{ _inventory_file.content | b64decode | from_yaml }}"
+
+- name: Process each group with hosts
+  ansible.builtin.include_tasks:
+    file: parse_inventory.yml
+  loop: "{{ inventory_data | dict2items | selectattr('value.hosts', 'defined') | list }}"
+  loop_control:
+    loop_var: group_item

roles/cifmw_helpers/tasks/parse_inventory.yml

@@ -0,0 +1,14 @@
+---
+- name: "Add hosts for group {{ group_item.key }}"
+  ansible.builtin.add_host:
+    name: "{{ host_item.key }}"
+    groups: "{{ group_item.key }}"
+    ansible_host: "{{ host_item.value.ansible_host | default(omit) }}"
+    ansible_ssh_common_args: "{{ host_item.value.ansible_ssh_common_args | default(omit) }}"
+    ansible_ssh_private_key_file: "{{ host_item.value.ansible_ssh_private_key_file | default(omit) }}"
+    ansible_user: "{{ host_item.value.ansible_user | default(omit) }}"
+    ansible_connection: "{{ host_item.value.ansible_connection | default(omit) }}"
+    cifmw_hypervisor_host: "{{ host_item.value.cifmw_hypervisor_host | default(omit) }}"
+  loop: "{{ group_item.value.hosts | dict2items }}"
+  loop_control:
+    loop_var: host_item