Added rust

Author: rohe

.github/workflows/python-app.yml

@@ -29,6 +29,8 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Install rust
+      run: sudo apt-get install rust
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip