Update dotnet.yml

Author: 0Lucifer0

.github/workflows/dotnet.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Check Tag
       id: check-tag
       run: |
-        if [[ ${{ github.event.ref }} =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+        if [[ v${{ github.event.ref }} =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
             echo ::set-output name=match::true
         fi