This removes ~70 medium/low severity CVEs reported on our Docker image,
by removing `build-essential` from being installed by default in the
Docker image.
We only need it when compiling Redis, which is needed on _some_ ARM
systems, that re configured with a page-size of greater than 4096. For
example, CentOS 8.
This is part of supporting running Appsmith with readonly root FS. This
moves the supervisord configuration, and runtime files, like the unix
socket file, and the PID file, to `$TMP`.
This is another step towards supporting running with readonly root FS,
and only making runtime changes in the container in `/tmp` or in
`/appsmith-stacks`, and nowhere else.
Move the files that are copied into the Docker image, into an `fs`
folder, that reflects the folder structure of that in the image. This
means two things right away:
1. A single `COPY` instruction in `Dockerfile` is enough to copy all the
files to their places.
2. The structure of files in the repo reflects that in the Docker image.
This makes working with the files/folders and troubleshooting with them
much easier.
❗ Note: **There's actually only 3 files changed, rest are just moved.**
