I had problems with my CI integration. When dgoss runs my container it cannot access to mounted directory files.

I have this CI configuration:

image: docker:latest

services:
  - docker:dind
test:
  stage: test
  script:
    - apk add bash curl --no-cache
    - curl -fsSL https://goss.rocks/install | sh
    - docker pull "$CI_REGISTRY_IMAGE"
    - dgoss run "$CI_REGISTRY_IMAGE"

dgoss fails with output:

INFO: Starting docker container
INFO: Container ID: bbba20c7
INFO: Sleeping for 0.2
INFO: Running Tests
sh: /goss/goss: not found
ERROR: Job failed: exit code 127

Some painful debugging shown that directory mounted as /goss to container with goss binary file is empty while source temporary directory on host /tmp/tmp.XXXXXXXXXX contains correct files.
I put some patches in dgoss script that make temporary directory appear in CWD and problem seems to be fixed. I suppose that mounted directory in gitlab pipelines environment in /tmp is inaccessible in container context.

I suggest you can simply parametrize location of $tmp_dir to fix this issue.