persistent ccache for ornl mantid runners

[idigs]

create the /ccache directory for github runner containers. This is currently accomplished through docker volumes:

- name: Deploy dockerized GitHub runner
  community.docker.docker_container:
    name: "{{ runner_name }}"
    image: "ghcr.io/{{ organization }}/github-runner-alma9:latest"
    detach: yes
    init: yes
    network_mode: host
    recreate: yes
    pull: yes
    shm_size: 512M
    volumes:
      - "{{ runner_name }}_ccache:/ccache"
      - "{{ runner_name }}_external_data:/mantid_data"

https://github.com/mantidproject/dockerfiles/pull/146/files#diff-88f78a31bbb9782a33e4398c4da8eee892b6b9ce69e22356b2be243226f08494