Resumed previous os setting to ensure actions job run successfully

Author: fungss

.github/workflows/unit-test.yaml

@@ -1,32 +1,32 @@
-name: Unit Tests Linux
+name: Unit Test Linux
 
 on:
   push:
   # pull_request:
 
 jobs:
   run-tests:
-    # strategy:
-    #   fail-fast: false
-    #   matrix:
-    #     os: [ubuntu-latest]
-    #     python-version:
-    #     - "3.9"
-    #     - "3.10"
-    #     - "3.11"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        python-version:
+        - "3.9"
+        - "3.10"
+        - "3.11"
 
     name: unit-test
-    # runs-on: ${{ matrix.os }}
-    runs-on: python:alpine
+    runs-on: ${{ matrix.os }}
+    # runs-on: python:alpine
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
 
-      # - name: Set up Python
-      #   uses: actions/setup-python@v4
-      #   with:
-      #       python-version : ${{ matrix.python-version }}
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+            python-version : ${{ matrix.python-version }}
 
       - name: Install dependencies
         run: |