[.github/workflows/main.yml] Python 3.6 workaround (supports Linux only until my issue is resolved actions/setup-python#544 )

Author: SamuelMarks

.github/workflows/main.yml

@@ -10,12 +10,30 @@ on:
     - reopened
 
 jobs:
+    test_3_6:
+        name: Linux 3.6
+        runs-on: ubuntu-20.04
+        steps:
+        -   uses: actions/checkout@v3
+        -   name: Set up Python 3.6
+            uses: actions/setup-python@v4
+            with:
+                python-version: 3.6
+                architecture: x64
+        -   name: install_dependencies
+            run: |
+                python -m pip install --upgrade pip
+                python -m pip install --upgrade setuptools wheel
+                pip install -r requirements.txt
+        -   name: Test with unittest
+            run: |
+                python setup.py test
     test:
         name: ${{ matrix.os.name }} ${{ matrix.python-version }}
         runs-on: ${{ matrix.os.runs-on }}
         strategy:
             matrix:
-                python-version: [3.6, 3.7, 3.8, 3.9, '3.10', '3.11']
+                python-version: [3.7, 3.8, 3.9, '3.10', '3.11']
                 os:
                     -   name: Linux
                         runs-on: ubuntu-latest