Hi, sorry that you didn’t get any response. I will try to answer some of the questions:
IDEs I would recommend VS Code, then install both the elixir-tools and Elixir LS extensions for better language server experience.
Dev Containers: There is a template configuration HERE for an Elixir Dev container environment with Phoenix, Node and PostgreSQL installed, which you could use and customize to your liking.
Absinthe Subscriptions: The only resource that comes to mind is this course by Pragmatic Studio. The course does have you might be looking for, although it’s paid. There also the book Craft GraphQL APIs in Elixir with Absinthe.
