* enable servers in sandbox to listen on localhost (127.0.0.1) instead of 0.0.0.0, ensuring servers can be container/host-agnostic
* Merge remote-tracking branch 'origin/main' into sandbox_localhost_works
* instant (dev) sandbox
* leave Dockerfile as is to pass deploy test
* fix comma
* fix prod build
* do not use "images exists" which docker does not support
* separate dev-mode flag
* Merge remote-tracking branch 'origin/main' into instant_sandbox