Ship ai3test inside a container

Used to ship and run tests from inside test hosts.

.gitlab-ci.yml

+image: registry.git.autistici.org/ai3/docker/float-runner:master
+
+stages:
+  - docker_build
+
+variables:
+  IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+
+docker_build_and_release_tests:
+  stage: docker_build
+  image: docker:latest
+  services:
+    - docker:dind
+  script:
+    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.git.autistici.org
+    - cd test && docker build --build-arg ci_token=$CI_JOB_TOKEN --pull -t $IMAGE_TAG .
+    - docker tag $IMAGE_TAG $CI_REGISTRY_IMAGE:integration-test
+    - docker push $CI_REGISTRY_IMAGE:integration-test
+  only:
+    changes:
+      - test/**

playbooks/ai3-test-docker.yml

+---
+
+- hosts: host1
+  gather_facts: no
+  tasks:
+
+    - name: Dump Ansible configuration for test
+      copy:
+        dest: /tmp/test-config.yml
+        content: "{{ vars|to_nice_yaml }}"
+
+    - name: Setup test Docker image
+      docker_image:
+        name: registry.git.autistici.org/ai3/config:integration-test
+        force: true
+      when: "float_debian_dist == 'stretch'"
+
+    - name: Setup test Docker image
+      command: "podman pull registry.git.autistici.org/ai3/config:integration-test"
+      when: "float_debian_dist != 'stretch'"
+
+    - name: Run tests
+      command: docker run --net host --mount type=bind,source=/tmp/test-config.yml,destination=/test-config.yml registry.git.autistici.org/ai3/config:integration-test

test/Dockerfile

+FROM ai3/float:integration-tests
+
+RUN apt-get -q update && env DEBIAN_FRONTEND=noninteractive \
+    apt-get install --no-install-recommends -y python python-pip python-setuptools python-yaml python-nose
+
+ADD . /config
+WORKDIR /config
+RUN python setup.py install
+
+ENV TEST_CONFIG=/test-config.yml
+ENV PYTHONPATH=/src
+CMD ["nosetests", "-v", "ai3test"]