Speed up artifact upload with explicit zip.

GitHub has limits on the number of files that can be used with
upload-artifact, and it sounds like it will also be faster to compress
locally before uploading.

.github/workflows/build.yml

@@ -3,7 +3,6 @@ name: Build
 on: [push, pull_request]
 
 jobs:
-
   build:
     runs-on: windows-latest
     steps:
@@ -52,7 +51,10 @@ jobs:
           $env:PYTHONPATH=".;./pydcs"
           pyinstaller pyinstaller.spec
 
+      - name: Create archive
+        run: Compress-Archive -Path .\dist\dcs_liberation\ -DestinationPath dist\dcs_liberation.zip
+
       - uses: actions/upload-artifact@v2
         with:
           name: dcs_liberation
-        path: dist/
+          path: dist/dcs_liberation.zip