Add checkout step to github workflow

Author: lvk88

.github/workflows/build-and-test.yml

@@ -15,6 +15,8 @@ jobs:
           wget --no-check-certificate https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
           chmod +x nuget.exe
           mono nuget.exe install python -Version 3.13.0
+      - name: Checkout source code
+        uses: actions/checkout@v4
       - name: Execute build
         run: |
           cmake --preset mingw-release