Add configuration for github actions to test linux on pull requests

.github/workflows/linux.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the develop branch
+  push:
+    branches: [ develop ]
+  pull_request:
+    branches: [ develop ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  test:
+    name: Test on node ${{ matrix.python_version }} and ${{ matrix.os }}
+    # The type of runner that the job will run on
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: [3.6]
+        # python-version: [3.6, 3.7, 3.8, 3.9]
+        os: [ubuntu-16.04]
+        # os: [ubuntu-16.04, ubuntu-latest, windows-latest, macos-10.15]
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pyqt5==5.9 lxml pytest pytest-faulthandler
+        sudo apt-get -qq update
+        sudo apt-get -qq install python3-pip python3-dev build-essential qt5-default libxml2-dev libxslt1-dev mesa-utils libgl1-mesa-glx libgl1-mesa-dev libxcb-xinerama0-dev
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Test with pytest
+      run: |
+        xvfb-run -s '-screen 0 640x480x24 +extension GLX' pytest -vs