run nuget login only when releasing

Author: ssg

.github/workflows/build.yml

@@ -18,18 +18,19 @@ jobs:
       with:
         dotnet-version: 10.0.x
 
-    - name: NuGet login
-      uses: NuGet/login@v1
-      id: login
-      with:
-        user: ${{secrets.NUGET_USER}}
-
     - name: Build
       run: dotnet build --configuration Release
 
     - name: Run tests
       run: dotnet test --no-build --configuration Release
 
+    - name: NuGet login
+      uses: NuGet/login@v1
+      if: startsWith(github.ref, 'refs/tags/')
+      id: login
+      with:
+        user: ${{secrets.NUGET_USER}}
+
     - name: Pack
       if: startsWith(github.ref, 'refs/tags/')
       run: dotnet pack src --no-build --configuration Release --output ./nupkg