Set up continuous integration

.gitlab-ci.yml

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+stages:
+  - setup
+  - test
+
+setup:docker:linux:
+  image: docker:18.09.0
+  stage: setup
+  variables:
+    DOCKER_HOST: tcp://docker:2375/
+    DOCKER_DRIVER: overlay2
+    DOCKER_IMAGE_NAME_CI: ${CI_REGISTRY_IMAGE}/puma-ci-linux:${CI_COMMIT_REF_SLUG}
+  services:
+    - docker:dind
+  script:
+    # Login to our registry
+    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin ${CI_REGISTRY}
+    - cd ./ci/docker/linux
+    - docker build --target PUMA_CI_LINUX -t ${DOCKER_IMAGE_NAME_CI} .
+    - docker push ${DOCKER_IMAGE_NAME_CI}
+  tags:
+    - docker
+    - gce
+  only:
+    changes:
+      - ci/docker/linux/**/*
+
+.test_base_task: &test_base_task
+  script:
+    - pytest
+
+test:windows:
+  <<: *test_base_task
+  tags:
+    - gift-hopper
+    - windows
+  # This section should ideally be identical to the Linux section. However, we can't yet use Docker
+  # on the Hopper Windows version (1903) due to https://gitlab.com/gitlab-org/gitlab-runner/issues/4396
+  variables:
+    WORKON_HOME: /c/Users/Public/PythonVirtualEnvs
+    VIRTUAL_ENV_NAME: xononav-ci-${CI_JOB_ID}
+  before_script:
+    # Create and activate virtual environment
+    - mkvirtualenv.bat --python=python3.7.1.exe ${VIRTUAL_ENV_NAME}
+    - source ${WORKON_HOME}/${VIRTUAL_ENV_NAME}/Scripts/activate
+  after_script:
+    # Cleanup virtual environment
+    - rmvirtualenv.bat ${VIRTUAL_ENV_NAME}
+
+test:linux:
+  <<: *test_base_task
+  image: registry.gitlab.com/gift-surg/puma/puma-ci-linux:master
+  tags:
+    - gift-little
+    - docker

ci/docker/linux/Dockerfile

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+FROM ubuntu:18.04 AS PUMA_CI_LINUX
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y \
+        tzdata \
+        git-core \
+        python3.7 \
+        python3-distutils \
+        curl \
+    && rm -rf /var/lib/apt/lists/*
+# Make python3.7 available via python
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3.7 1
+RUN curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
+RUN python get-pip.py
+# Install needed tools
+RUN pip install pytest

tests/ensure_ci_works_test.py

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+from unittest import TestCase
+
+
+class EnsureCIWorksTest(TestCase):
+
+    def test_ci_works(self):
+        self.assertTrue(True)