Only build master on push and upload PR nupkgs

Author: piksel

.github/workflows/on-push.yml

@@ -1,6 +1,8 @@
-name: On Push
+name: Build master on push
 
-on: [push]
+on:
+  push:
+    branches: [ master ]
 
 jobs:
   BuildAndTest:

.github/workflows/pull-request.yml

@@ -73,7 +73,6 @@ jobs:
       run: dotnet test -c ${{ matrix.configuration }} -f net45
 
   Pack:
-    if: 1 == 2
     needs: [Build, Test]
     runs-on: windows-latest
     env:
@@ -99,7 +98,7 @@ jobs:
       run: dotnet pack src/ICSharpCode.SharpZipLib/ICSharpCode.SharpZipLib.csproj --configuration Release --output dist /p:Version=$(git describe --abbrev | % { $_.substring(1) })-PR
 
     - name: Upload nuget package artifact
-      uses: actions/upload-artifact@v1
+      uses: actions/upload-artifact@v2
       with:
         name: Nuget package
         path: dist/*.nupkg