Run release from ubuntu

Author: Martin Boje Carpentier

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
   deploy:
     name: 'Deploy to Nuget'
     if: github.event_name == 'release'
-    runs-on: windows-2019
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v2