ci: use proper env

Author: Belphemur

.github/workflows/dotnet.yml

@@ -125,7 +125,7 @@ jobs:
       - name: Restore
         run: dotnet restore -r ${{ env.ARCH }}
       - name: Tets
-        run: dotnet test -c Release --no-restore  --logger trx --results-directory "TestResults-${{ matrix.dotnet-version }}"
+        run: dotnet test -c ${{env.CONFIGURATION}}  --no-restore  --logger trx --results-directory "TestResults-${{ matrix.dotnet-version }}"
       - name: Fetch tags
         run: git fetch --tags --force
       - name: Calculate version