fix(docker): add working docker-compose with data volume

[sbnsec]

Description

Add working docker-compose with data volume

Replace the full source bind-mount (which hid Magma UI assets and caused 'plugins/magma/dist/assets/' startup error) with a named volume mounted to /usr/src/app/data.

CALDERA now starts cleanly via 'docker compose up' and preserves operation data between runs.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

1. docker compose up --build

user@debian:~$ uname -a
Linux debian 6.1.0-37-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.140-1 (2025-05-22) x86_64 GNU/Linux
user@debian:~$ docker -v
Docker version 28.2.2, build e6534b4
user@debian:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 12 (bookworm)
Release:	12
Codename:	bookworm

✅ CALDERA starts, UI accessible at http://localhost:8888.

2. Verified an operation run; data survives docker compose down/up.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• No changes needed to the documentation
• No further testing needed as this is a bug fix