install mupif in workflow definition (and use uv there for the speedup)

.github/workflows/tests.yml

@@ -24,8 +24,10 @@ jobs:
       run: |
         wget -qO - https://www.mongodb.org/static/pgp/server-5.0.asc | sudo apt-key add - && echo "deb http://repo.mongodb.org/apt/debian buster/mongodb-org/5.0 main" | sudo tee /etc/apt/sources.list.d/mongodb-org-5.0.list
         sudo apt-get update && sudo apt-get -y install python3-wheel python3-pip mongodb-org
-        python -m pip install -q flake8
-        pip install -r requirements.txt
+        python -m pip install -q uv
+        uv pip install --system flake8
+        uv pip install --system git+https://github.com/mupif/mupif.git@master
+        uv pip install --system -r requirements.txt
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names