also test Ubuntu packages

.github/workflows/.github-actions-demo.yml

@@ -2,7 +2,7 @@ name: Test Processing Tools
 on: [push]
 
 jobs:
-  build:
+  pip:
 
     runs-on: ${{ matrix.os }}
     strategy:
@@ -20,7 +20,26 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pytest pandas scipy h5py vtk matplotlib pyyaml
-      - name: Test with pytest
+      - name: Install and run unit tests
         run: |
           python -m pip install ./python --no-deps -vv --use-feature=in-tree-build
           pytest python
+
+  apt:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install pytest
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest
+      - name: Install dependencies
+        run: >
+          sudo apt-get update &&
+          sudo apt-get install python3-pip python3-pytest python3-pandas python3-scipy 
+          python3-h5py python3-vtk7 python3-matplotlib python3-yaml -y
+      - name: Run unit tests
+        run: |
+          PYTHONPATH=${PWD}/python python -m pytest python