I’m running an ansible playbook the following way:

1. created a docker-image

FROM php:8.1.28-apache-bookworm

RUN apt install -y python3 
  && ln -s /usr/bin/python3 /usr/bin/python

2. started the container
3. Added it to my inventory

all:
  vars:
    ansible_connection: docker
  hosts:
    test-container:

4. Ran the following task

    - name: Download limesurvey installation
      # debugger: on_failed
      ansible.builtin.get_url:
        url: "https://github.com/LimeSurvey/LimeSurvey/archive/refs/tags/{{ limesurvey_version }}.tar.gz"
        dest: "/tmp/limesurvey.tar.gz"
        mode: "755"

and I get the following error:

{
  "changed": false, 
  "module_stderr": "",
  "module_stdout": "",
  "msg": "MODULE FAILUREnSee stdout/stderr for the exact error",
  "rc": 0
}

I’m pretty sure, that this is a setup issue, but how can I debug this error?

UPDATE:

• the task seems to work, but ansible complains
• Adding ANSIBLE_KEEP_REMOTE_FILES=1 allows to run re-run the files locally, also adding debug statements. It didn’t help, because running the files in the container just worked (see -vvv for the actual commands).
• I edited the local get_url module and raised Exception till I pinned down the error to the following line.
  https://github.com/ansible/ansible/blob/devel/lib/ansible/modules/get_url.py#L432. That worked because I always found the specific error, except after the line in question