New features and improvements
- Removing the acs clone step from the Docker image.
- Remove comments from Dockerfile.
- Split acs installation into dependency and acs installation stages.
- Removed object files -> reducing image size a lot!
- fixed the JAVA_HOME path issue.
- Getting acs (2020JUN) as a submodule. Also removing unneeded patches.
- remove slides of ACS workshop 2020 ...
- remove SSH from README, we do not use SSH anymore