Docker for redhat since github doesnt give me runners

.github/workflows/build.yml

@@ -6,24 +6,35 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest, centos-8]
+        os: [ubuntu-latest, macos-latest, windows-latest, centos]
 
     runs-on: ${{ matrix.os }}
 
     steps:
     - uses: actions/checkout@v2
 
     - name: Set up Python
+      if: matrix.os != 'centos'
       uses: actions/setup-python@v2
       with:
         python-version: '3.x'
 
-    - name: Install dependencies
+    - name: Install dependencies (Ubuntu/macOS/Windows)
+      if: matrix.os != 'centos'
       run: |
         python -m pip install --upgrade pip
-        pip install pyinstaller  # Install PyInstaller
+        pip install pyinstaller
 
-    - name: Build with PyInstaller
+    - name: Install dependencies in CentOS via Docker
+      if: matrix.os == 'centos'
+      run: |
+        docker run --rm -v $(pwd):/src -w /src centos:8 \
+        bash -c "yum install -y python3 python3-devel gcc && \
+                 pip3 install pyinstaller && \
+                 pyinstaller --onefile --windowed SortingApp.py"
+
+    - name: Build with PyInstaller (Ubuntu/macOS/Windows)
+      if: matrix.os != 'centos'
       run: |
         pyinstaller --onefile --windowed SortingApp.py