Update github codespace and justfile

[mrchrisadams]

This PR updates the devcontainer file used to define what is built when spinning up a codehub codespace.

It also adds a slightly more convenient Justfile, for running django management commands and using Marimo for data analysis

[github-actions]

Old Energy Estimation

Eco-CI Output:

Label	🖥 avg. CPU utilization [%]	🔋 Total Energy [Joules]	🔌 avg. Power [Watts]	Duration [Seconds]
Total Run (incl. overhead)	13.0257	826.113	2.96	279
checkout	10.79	3.6596	1.83	2
pip install uv wheel	10.94	3.6613	1.83	2
pip install requirements	61.4425	24.6026	4.92	5
pytest	11.8853	794.189	2.97	267

🌳 CO2 Data:
City: Boydton, Lat: 36.6676, Lon: -78.3875
IP: 172.200.199.161
CO₂ from energy is: 0.280052307 g
CO₂ from manufacturing (embodied carbon) is: 0.079602552 g
Carbon Intensity for this location: 339 gCO₂eq/kWh
SCI: 0.359655 gCO₂eq / pipeline run emitted

[github-actions]

Eco-CI Output:

Label	🖥 avg. CPU utilization [%]	🔋 Total Energy [Joules]	🔌 avg. Power [Watts]	Duration [Seconds]
Total Run (incl. overhead)	14.2255	859.111	3.09	278
checkout	20.3825	15.8086	3.16	5
pip install uv wheel	30.12	17.3719	4.34	4
pip install requirements	58.1629	41.0946	5.87	7
pytest	12.5395	784.836	3.03	259

🌳 CO2 Data:
City: Boydton, Lat: 36.6676, Lon: -78.3875
IP: 20.97.191.38
CO₂ from energy is: 0.291238629 g
CO₂ from manufacturing (embodied carbon) is: 0.079317239 g
Carbon Intensity for this location: 339 gCO₂eq/kWh
SCI: 0.370556 gCO₂eq / pipeline run emitted

[mrchrisadams]

ZOMG. It looks like adding this triggers the proper build steps!

"customizations": {
    "codespaces": {},
}