Update build-and-test.yml

Author: BenjaminRodenberg

.github/workflows/build-and-test.yml

@@ -34,7 +34,7 @@ jobs:
         uses: actions/checkout@v2      
       - name: Install scipy (see https://github.com/precice/fenics-adapter/issues/189)
         run:  |
-          apt install python3-scipy
+          apt install -y python3-scipy
       - name: Install fake precice
         run:  |
           mkdir -p precice