Update release.yml

Former-commit-id: d55127a0f7

.github/workflows/release.yml

@@ -1,7 +1,6 @@
 name: NuGet release
 on:
-  pull_request:
-    types: [opened, closed]
+  push:
     branches:
       - release
 jobs:
@@ -10,18 +9,15 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - name: Prepare FFMpeg
-      if: github.event.pull_request.merged == false
       run: sudo apt-get update && sudo apt-get install -y ffmpeg
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.101
+        dotnet-version: 3.1
     - name: Build solution -c Release
       run: dotnet build
     - name: Run unit tests
-      if: github.event.pull_request.merged == false
       run: dotnet test
     - name: Publish NuGet package
-      if: github.event.pull_request.merged == true
       run: NUPKG=`find . -type f -name FFMpegCore*.nupkg` && dotnet nuget push $NUPKG -k ${{ secrets.NUGET_TOKEN }} -s https://api.nuget.org/v3/index.json