diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 10570e0..d261b69 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -6,25 +6,23 @@ on:
   pull_request:
     branches: [ "main" ]
 
+# Set global defaults, including the working directory
+defaults:
+  run:
+    working-directory: ./src  # Default working directory for all jobs and steps
+
 jobs:
   build:
-
     runs-on: ubuntu-latest
-
     steps:
     - uses: actions/checkout@v3
     - name: Set up .NET
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: | 
-          3.1.x
-          6.0.x
-          7.0.x
-          8.0.x
-        dotnet-quality: 'preview'
+        dotnet-version: ${{ vars.DOTNET_VERSION }}  # Using repository-level environment variable
     - name: Restore dependencies
-      run: dotnet restore src/Nino.sln
+      run: dotnet restore
     - name: Build
-      run: dotnet build src/Nino.sln --no-restore
+      run: dotnet build --no-restore
     - name: Test
-      run: dotnet test src/Nino.sln --no-build --verbosity normal
+      run: dotnet test --no-build --verbosity normal