CI/CD deployment issues

I am trying to deploy CI/CD on GitLab, but I am facing the following problem. Is there any method to solve this issue?
Library/PackageCache/com.cesium.unity@1.6.1/Runtime/Cesium3DTile.cs(2,7): error CS0246: The type or namespace name ‘Reinterop’ could not be found (are you missing a using directive or an assembly reference?)

If you’re trying to build Cesium for Unity from source (as opposed to using the built version we provide), you need to follow the developer setup instructions:

You may also find it helpful to look at the steps executed by our own CI process: