overhaul to create a test package, publish it, and containerize it

.gitlab-ci.yml

-docker-build:
-  # Use the official docker image.
-  image: docker:stable
+stages:
+  - build
+  - test
+  - publish
+
+variables:
+  PACKAGE_NAME: "pak"
+  DOCKER_IMAGE: "$CI_REGISTRY_IMAGE/$PACKAGE_NAME"
+
+before_script:
+  - pip install setuptools
+
+build_package:
   stage: build
-  services:
-    - docker:26.0.1-dind
-  variables:
-    DOCKER_IMAGE_NAME: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-    DOCKER_TLS_CERTDIR: "/certs"
-  before_script:
-    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
-  # All branches are tagged with $DOCKER_IMAGE_NAME (defaults to commit ref slug)
-  # Default branch is also tagged with `latest`
   script:
-    - docker build --pull -t "$DOCKER_IMAGE_NAME" .
-    - docker push "$DOCKER_IMAGE_NAME"
-    - |
-      if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
-        docker tag "$DOCKER_IMAGE_NAME" "$CI_REGISTRY_IMAGE:latest"
-        docker push "$CI_REGISTRY_IMAGE:latest"
-      fi
-  # Run this job in a branch where a Dockerfile exists
-  rules:
-    - if: $CI_COMMIT_BRANCH
-      exists:
-        - Dockerfile
+    - python setup.py sdist bdist_wheel
+  artifacts:
+    paths:
+      - dist/*
+
+test_package:
+  stage: test
+  script:
+    - pip install .  # Install the package
+    - pytest  # Run tests
+
+publish_package:
+  stage: publish
+  script:
+    - pip install twine  # Install twine to publish the package
+    - twine upload dist/*  # Publish the package to the GitLab package registry
+
+build_and_push_docker_image:
+  stage: publish
+  script:
+    - docker build -t $DOCKER_IMAGE:$CI_COMMIT_SHORT_SHA .
+    - docker push $DOCKER_IMAGE:$CI_COMMIT_SHORT_SHA
+  only:
+    - main  # Only run on the main branch

Dockerfile

-# Use a base image
-FROM ubuntu:22.04
+FROM python:3.12-slim
 
-RUN apt update && apt upgrade -y
-RUN apt install -y python3.11
+# Set working directory
+WORKDIR /app
 
-# Print "Hello, World!" when the container starts
-CMD echo "Hello, World!" && echo "Hello again!"
+# Copy the package files
+COPY . .
\ No newline at end of file
+
+# Install the package
+RUN pip install .
+
+# Command to run the package (adjust as needed)
+CMD ["python", "-c", "from pak.hello import hello; print(hello())"]
\ No newline at end of file

pak/hello.py

+def hello():
+    return "Hello, World!"
\ No newline at end of file

pyproject.toml

+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "pak"
+version = "0.1.0"
+description = "A simple Python package."
+authors = [{ name = "Your Name", email = "your.email@example.com" }]
+dependencies = [
+    "unittest"
+]
\ No newline at end of file

tests/test_hello.py

+import unittest
+from mod.hello import hello
+
+class TestMyModule(unittest.TestCase):
+    def test_hello(self):
+        self.assertEqual(hello(), "Hello, World!")
+
+if __name__ == '__main__':
+    unittest.main()
\ No newline at end of file