Add reusable workflow for python packaging tests

Closes #8

Author: jeromekelleher

.github/workflows/python-packaging.yml

@@ -0,0 +1,57 @@
+Name: Reusable Python packaging tests
+
+on:
+  workflow_call:
+      additional_apt_packages:
+        description: 'Additional APT packages to install'
+        required: false
+        type: string
+        default: ''
+      working_directory:
+        description: 'Working directory to use (default if unspecified)'
+        required: false
+        type: string
+        default: '.'
+      cli_test_cmd:
+        description: 'CLI test command to run'
+        default: ''
+        type: string
+
+jobs:
+  name: Python packaging
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.12.1
+        with:
+          access_token: ${{ github.token }}
+
+      - uses: actions/checkout@v4.2.2
+
+      - name: Install additional APT packages
+        if: ${{ inputs.additional_apt_packages != '' }}
+        run: sudo apt-get update && sudo apt-get install -y ${{ inputs.additional_commands }}
+
+      - uses: actions/setup-python@v5.4.0
+        with:
+          python-version: '3.12'
+
+      - name: Install build deps
+        run: |
+          pip install uv
+          uv pip install --system build twine validate-pyproject[all]
+
+      - name: Check package
+        working-directory: ${{ inputs.working_directory }}
+        run: |
+          validate-pyproject pyproject.toml
+          python -m build
+          python -m twine check --strict dist/*
+
+      - name: Install
+        working-directory: ${{ inputs.working_directory }}
+        run: python -m pip install dist/*.whl
+
+      - name: Run CLI (if present)
+        if: ${{ inputs.cli_test_cmd != '' }}
+        run: ${{ inputs.cli_test_cmd }}