Using rye for Python and package management

.github/workflows/run-tests.yaml

@@ -12,22 +12,17 @@ jobs:
 
     name: Python ${{ matrix.python-version }} on ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
 
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
-      with:
-        python-version: ${{ matrix.python-version }}
-        cache: 'pip'
+    - name: Checkout code
+      uses: actions/checkout@v4
 
-    - name: Install dependencies
+    - name: Setup rye (multiOS)
+      uses: atu4403/setup-rye-multiOS@v1
       run: |
-        python -m pip install --upgrade pip
-        pip install -r requirements.lock
-      timeout-minutes: 5
+        rye pin ${{ matrix.python-version }}
+        rye sync
 
     - name: Run tests
       run: |
-        export PYTHONPATH=$(pwd)/src:$PYTHONPATH
         python tests/test_mepo_commands.py -v
       timeout-minutes: 5