Add CI workflows for automated testing

- Add comprehensive CI workflow with matrix testing across OS and Python versions
- Test on Ubuntu, macOS, and Windows with Python 3.8-3.12
- Include linting with ruff and format checking
- Add Helm plugin installation test
- Include code coverage reporting (ready for Codecov)
- Add simpler CI workflow example as alternative

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ritwik-g

.github/workflows/ci-simple.yml.example

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+# Alternative simpler CI workflow - rename to ci.yml if you prefer this approach
+
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.12"]  # Test min and max supported versions
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install uv
+      uses: astral-sh/setup-uv@v5
+
+    - name: Install dependencies
+      run: uv sync --all-extras --dev
+
+    - name: Run tests
+      run: |
+        uv run pytest -v --cov=helm_values_manager --cov-report=term-missing
+
+    - name: Check code quality
+      if: matrix.python-version == '3.12'
+      run: |
+        uv run ruff check .
+        uv run ruff format --check .

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        exclude:
+          # Skip some combinations to reduce CI time
+          - os: macos-latest
+            python-version: "3.8"
+          - os: macos-latest
+            python-version: "3.9"
+          - os: windows-latest
+            python-version: "3.8"
+          - os: windows-latest
+            python-version: "3.9"
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install uv
+      uses: astral-sh/setup-uv@v5
+      with:
+        version: "0.5.14"
+
+    - name: Install dependencies
+      run: |
+        uv sync --all-extras --dev
+
+    - name: Run unit tests
+      run: |
+        uv run pytest tests/ -v --cov=helm_values_manager --cov-report=xml --cov-report=term
+
+    - name: Run integration tests
+      run: |
+        uv run pytest tests/test_integration.py -v
+
+    - name: Upload coverage to Codecov
+      if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.12'
+      uses: codecov/codecov-action@v4
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        file: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+
+    - name: Install uv
+      uses: astral-sh/setup-uv@v5
+      with:
+        version: "0.5.14"
+
+    - name: Install dependencies
+      run: |
+        uv sync --all-extras --dev
+
+    - name: Run ruff check
+      run: |
+        uv run ruff check .
+
+    - name: Run ruff format check
+      run: |
+        uv run ruff format --check .
+
+    - name: Run mypy
+      run: |
+        uv run mypy helm_values_manager --ignore-missing-imports || true
+
+  plugin-test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install Helm
+      uses: azure/setup-helm@v3
+      with:
+        version: 'v3.15.0'
+
+    - name: Test Helm plugin installation
+      run: |
+        helm plugin install .
+        helm values-manager --version
+        helm plugin uninstall values-manager