job.yaml

- hosts: localhost
  connection: local
  tasks:
    - name: Create a list of YAML files to validate
      find:
        paths: .
        patterns: "*.yaml"
        recurse: true
      register: yaml
      changed_when: false
    - include_tasks: validate_yaml.yaml
      with_items: "{{ yaml.files | map(attribute='path') | list }}"

validate_yaml.yaml

- name: "Validate {{ item }}"
  validate_yaml:
    path: "{{ item }}"
  ignore_errors: True