---
- name: buildah config workingdir 
  command: buildah config --workingdir /opt nginxc

- name: get buildah config workingdir
  command: buildah run nginxc "pwd"
  register: checkworkingdir
  failed_when: "'/opt' not in checkworkingdir.stdout"

- name: buildah config env
  command: buildah config --env foo=bar nginxc

- name: get buildah config env
  command: buildah run nginxc env
  register: env
  failed_when: "'foo=bar' not in env.stdout"