Add a simple build and smoke workflow - and package (#20)

* Add a build workflow

* Add a smoke test workflow of forecast.py

* Add preliminary package code to streamline tests

.github/workflows/python.yml

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+name: Build
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  Build:
+    runs-on: ubuntu-latest
+    name: Install
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install .
+
+      - name: Smoke test
+        run: |
+          pip install pytest
+          pytest ./tests

pytest.ini

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+[pytest]
+testpaths = tests

setup.py

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+from setuptools import setup, find_packages
+import os
+
+
+# Function to parse requirements.txt
+def parse_requirements(filename):
+    """Load requirements from a pip requirements file."""
+    with open(filename, "r") as file:
+        return file.read().splitlines()
+
+
+# Get the list of requirements from requirements.txt
+requirements_file = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), "requirements.txt")
+)
+install_requires = parse_requirements(requirements_file)
+
+setup(
+    name="spinup_nemo",
+    version="0.1",
+    packages=find_packages(include=["lib"]),
+    package_dir={"": "."},  # The root directory is the base
+    install_requires=install_requires,
+)

tests/test_forecast.py

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+"""
+This file contains tests for the 'forecast' module in the 'lib' package.
+
+The tests are written using pytest.
+"""
+
+import sys
+import os
+import pytest
+
+
+def test_import_forecast():
+    """Test that the forecast module can be imported successfully."""
+    try:
+        import lib.forecast
+
+        assert True, "forecast imported successfully."
+    except ImportError as e:
+        pytest.fail(f"Failed to import forecast: {e}")