Add codecov token

Author: bkoelman

.github/workflows/build.yml

@@ -133,6 +133,8 @@ jobs:
         dotnet pack --no-build --configuration Release --output $env:GITHUB_WORKSPACE/artifacts/packages /p:VersionSuffix=$env:PACKAGE_VERSION_SUFFIX
     - name: Upload packages to artifacts
       if: matrix.os == 'ubuntu-latest'
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       uses: actions/upload-artifact@v4
       with:
         name: packages