separated workflow for flaky selenium tests

.github/workflows/flaky-selenium.yml

@@ -0,0 +1,53 @@
+name: Flaky Selenium Tests
+
+on:
+  push:
+    branches: '*'
+  pull_request:
+    branches: '*'
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu, macos]
+        python-version: [ '3.7', '3.8', '3.9']
+      exclude: 
+        - os: ubuntu
+          python-version: '3.7'
+        - os: ubuntu
+          python-version: '3.9'
+        - os: macos
+          python-version: '3.8'
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+        architecture: 'x64'
+
+    - name: Set up Node
+      uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+
+    - name: Install JS
+      run: |
+        npm install
+
+    - name: Install Python dependencies
+      run: |
+        python -m pip install -U pip setuptools wheel
+        pip install --upgrade selenium
+        pip install pytest
+        pip install .[test]
+
+    - name: Run Tests
+      run: |
+        export JUPYTER_TEST_BROWSER=firefox
+        export MOZ_HEADLESS=1
+        pytest -sv nbclassic/tests/selenium

.github/workflows/selenium.yml

@@ -10,9 +10,16 @@ jobs:
     runs-on: ${{ matrix.os }}-latest
     strategy:
       fail-fast: false
-      matrix:
+       matrix:
         os: [ubuntu, macos]
         python-version: [ '3.7', '3.8', '3.9', '3.10' ]
+      exclude:
+        - os: ubuntu
+          python-version: '3.8'
+        - os: macos
+          python-version: '3.7'
+        - os: macos
+          python-version: '3.9'
     steps:
     - name: Checkout
       uses: actions/checkout@v2