incrementally add facts

add_facts.yml

---
- hosts: all
  connection: local
  tasks:
    - name: check
      local_action: debug msg={{ item.name }}
      with_items:
      - "{{ files }}"

    - name: register data
      set_fact:
        file_details: "{{ file_details|default({}) | combine( {item.name: { 'revision' : item.revision }} ) }}"
      with_items:
      - "{{ files }}"

    - name: see dict
      debug: msg="{{ file_details[item.name] }}"
      with_items:
      - "{{ files }}"

    - name: register second data
      set_fact:
        file_details2: "{{ file_details[item.name] | combine( { 'path' : item.location }) }}"
      with_items:
      - "{{ files }}"

    - name: check registration
      debug: msg="{{ file_details2 }}"