Speed up server install when testing

1. Currently the hotfixes are installed at the first start of a job.
2. If the Workspace is not purged the hotfixes are kept and not downloaded again.
3. If the job runs on a non-static docker, the workspace is purged.
4. Every time a job starts it installs the hotfixes

To speed up the deployment, the hotfixes could all be installed (except for example the one to be tested), archived (compressed or not, this may take time as well) and archived as artifacts in the standalone testing job.

This way a downstream job would have to copy retrieve the artifacts.
This will greatly reduce the setup time, especially when having more than 5 HF to install...