ci: add CI/CD and initial monorepo structure

.github/workflows/python-ci.yml

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+
+name: POSM Pipeline CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.11"
+        cache: 'pip'
+
+    - name: Install Dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install ruff pytest
+        # pip install -r requirements.txt (Uncomment when you add this file)
+
+    - name: Lint and Format with Ruff
+      run: |
+        # Fails the build if there are syntax errors or undefined names
+        ruff check . 
+        # Fails the build if the code is not formatted properly
+        ruff format --check .
+
+    - name: Run Unit Tests
+      run: |
+        pytest tests/

.gitignore

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+.env

Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+
+RUN pip install --upgrade pip && \
+    pip install -r requirements.txt
+
+COPY . .
+
+CMD ["python", "scripts/run_pipeline.py"]

pyproject.toml

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+[tool.ruff]
+# Set the maximum line length
+line-length = 100
+# Assume Python 3.11
+target-version = "py311"
+
+[tool.ruff.lint]
+# E: pycodestyle errors, F: Pyflakes (syntax errors), I: isort (import sorting)
+select = ["E", "F", "I"]
+
+[tool.pytest.ini_options]
+# Define where the test suite lives
+testpaths = ["tests"]
+# Add detailed output to the test logs
+addopts = "-v"

requirements.txt

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+ruff
+pytest

tests/mock_test.py

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+def test_placeholder():
+    """
+    A temporary placeholder test to ensure the GitHub Actions CI pipeline
+    runs successfully. Real pipeline tests will be added here later.
+    """
+    assert True