Configure Gitea Workflows and Add Build Scripts

- Update build-linux.yaml to use standard Ubuntu runner.
- Update build-windows.yaml to use tobix/pywine container for cross-compilation on Linux.
- Add build_app.py and check_ttx6.py helper scripts.

.gitea/workflows/build-windows.yaml

@@ -4,29 +4,24 @@ on: [push, pull_request]
 jobs:
   build:
     name: Build Windows
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
+    container:
+      image: tobix/pywine:3.10
     steps:
-      - name: Configure Git Redirect
-        run: git config --global url."http://192.168.50.24:3000/".insteadOf "http://server:3000/"
-
       - name: Checkout
         uses: actions/checkout@v3
 
-      - name: Setup Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.10'
-
       - name: Install Dependencies
         run: |
-          pip install -r requirements.txt
+          wine python -m pip install --upgrade pip
+          wine pip install -r requirements.txt
 
       - name: Build Executable
         run: |
-          pyinstaller --onefile --windowed --name TeletextEditor_Windows.exe --paths src src/main.py
+          wine pyinstaller --onefile --windowed --name TeletextEditor_Windows.exe --paths src src/main.py
 
       - name: Upload Artifact
         uses: actions/upload-artifact@v3
         with:
           name: TeletextEditor-Windows
-          path: dist/TeletextEditor_Windows.exe
+          path: dist/TeletextEditor_Windows.exe