[CI] Add nuget beta build support (#3113)

.github/workflows/dotnet.yml

@@ -1,8 +1,5 @@
 name: Dotnet Build
 
-concurrency: 
-  group: ${{ github.workflow }}-${{ github.ref }}
-
 on:
     push:
         branches: ["dev"]
@@ -35,6 +32,12 @@ jobs:
           - name: Is Tag Build
             if: startsWith(github.ref, 'refs/tags/')
             run: echo "IsTagBuild=true" >> $GITHUB_ENV
+            
+          - name: Generate Beta Suffix
+            if: startsWith(github.ref, 'refs/tags/') && contains(github.ref_name, '/')
+            env: 
+              REF_NAME: ${{ github.ref_name }}
+            run: echo "Suffix=${REF_NAME##*/}" >> $GITHUB_ENV
           
           - name: Generate Suffix
             if: env.IsTagBuild != 'true'