Add CI workflow (#2)

* Test code changes using CI

Author: avvertix

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on: 
+  push:
+    branches: 
+      - "main"
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Tests Python ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13-dev"]
+    
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
+        cache: pip
+        cache-dependency-path: |
+          **/setup.py
+          **/requirements*.txt
+
+    - name: Install dependencies
+      run: |
+        pip install -r requirements.txt -r requirements-dev.txt
+        
+    - name: Run Testsuite
+      run: |
+        pytest

setup.py

@@ -29,5 +29,6 @@
     ],
     packages=['parse_document_model'],
     include_package_data=True,
+    python_requires=">=3.9",
     install_requires=['pydantic>=2.9.0']
 )