Improved pyshop build and test process
- Bumped Python build version to 3.12
- Added tests for all supported Python versions 3.8, 3.9, 3.10, 3.11, 3.12
- Implemented build image with all needed dependencies for quicker builds
- Build Docker image for all supported versions 3.8, 3.9, 3.10, 3.11, 3.12