create zip only on tags

Author: w23

.github/workflows/build.yml

@@ -27,7 +27,7 @@ jobs:
       working-directory: ${{ runner.workspace }}/build
       run: cmake --build . --config Release
     - name: prepare release archive
-      if: matrix.os == 'windows-latest' # && startsWith(github.ref, 'refs/tags/v')
+      if: matrix.os == 'windows-latest' && startsWith(github.ref, 'refs/tags/v')
       run: |
         cmake -E make_directory ${{ runner.workspace }}/OpenSource-windows
         cmake -E copy ${{ github.workspace }}/misc/hl1.cfg ${{ github.workspace }}/misc/hl2.cfg ${{ github.workspace }}/misc/hl2eps.cfg ${{ github.workspace }}/misc/hl1.bat ${{ github.workspace }}/misc/hl2.bat ${{ github.workspace }}/misc/hl2eps.bat ${{ runner.workspace }}/build/Release/OpenSource.exe ${{ github.workspace }}/README.md ${{ runner.workspace }}/OpenSource-windows