Integrate CausalR into Shiny-Proxy

[jan-abel-inwt]

see https://github.com/Pandora-IsoMemo/data-tools/issues/86

• [x] run locally
• [x] check Dockerfile
• [x] add Jenkinsfile for CI
• [x] add workflow to deploy to ghcr
• [x] add image to pull-docker-images job in jenkins
• [x] add image to shiny-proxy

[jan-abel-inwt]

Everything is set up and ready. We are now awaiting the merge of PR #87. Once merged, we can proceed with testing.

[jan-abel-inwt]

App is online and can be found here https://isomemoapp.com/app/causalr-beta