Update Dotnet_template.yml

Author: vikas0212git

.github/workflows/Dotnet_template.yml

@@ -15,6 +15,9 @@ jobs:
    runs-on: ubuntu-latest
    steps:
     - uses: actions/checkout@v2
+    - uses: actions/setup-dotnet@v1
+      with:
+          dotnet-version: '3.1'
     - run: mkdir -p .nuget
     - name: Download nuget
       run:
@@ -28,8 +31,8 @@ jobs:
       run: mono .nuget/nuget.exe pack -NoDefaultExcludes
     - name: GitHub Release
       if: |
-         success() &&
-         startsWith(github.ref, 'refs/tags/')
+         (success() &&
+         startsWith(github.ref, 'refs/tags/'))
       uses: softprops/action-gh-release@v1
       with:
           files: ./**/*.nupkg