Dockerized shiny app: communication with external database

I am wondering if anyone could share their solution for dockerized shiny app, that is sourcing the data from an external sql database. Especially Dockerfile configuration principles & docker-compose file. Either docker solution or shinyproxy, dockerized database or not, I don't care :slight_smile: . I am having a hell of a time with it (and I am sure that only because of couple stupid mistakes & misunderstandings on my part).

Thank you!