Old Python needs old OS

.github/workflows/python-package.yml

@@ -11,12 +11,30 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
+    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
+        python -m pip install pytest
+        pip install -r requirements.txt
+    - name: Test with pytest
+      run: |
+        pytest
 
+  build_3_6:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        python-version: ["3.6"]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}