Update dockerfile to be arm64 friendly

What does this MR do?

Compiles the JPype1 pip dependency in a separate build context. This ensures that dependencies such as g++ can be installed without affecting the size of the resulting DAST image. The extra dependencies enable the image to be compiled on an arm64 machine.

What are the relevant issue numbers?

Build DAST images for arm64 architecture (gitlab-org/gitlab#385581 - closed)