As we got many questions related this, this is the highlight of which build tools versions were removed, and which ones are still pre-installed:
Removed
- build-tools-25.0.1
- build-tools-25.0.0
- build-tools-24.0.2
- build-tools-24.0.1
- build-tools-24.0.0
- build-tools-23.0.2
- build-tools-23.0.1
Preinstalled / available:
- build-tools-25.0.2
- build-tools-24.0.3
- build-tools-23.0.3
- build-tools-22.0.1
- build-tools-21.1.2
- build-tools-20.0.0
- build-tools-19.1.0
- build-tools-17.0.0
You can always see which versions are preinstalled in the related Dockerfile on GitHub