feat: zip static files

[alicecoordinator]

What does this PR do?

With these changes, the static files will be collected and gzipped during the docker image build. It will not be needed then to copy the static files over to a separate folder.

Changes to robosats-deploy will also be made, so that the nginx image can serve the gzipped files.

Checklist before merging

• Install pre-commit and initialize it: pip install pre-commit, then pre-commit install. Pre-commit installs git hooks that automatically check the codebase. If pre-commit fails when you commit your changes, please fix the problems it points out.

[alicecoordinator]

Changes to robosats-deploy: RoboSats/robosats-deploy#40

[KoalaSat]

@alicecoordinator The docker build failed:

2026-08-21T08:32:15.8218352Z --------------------
2026-08-21T08:32:15.8218574Z 
2026-08-21T08:32:15.8218712Z   34 |     
2026-08-21T08:32:15.8218882Z 
2026-08-21T08:32:15.8219031Z   35 | >>> RUN cp .env-sample .env \
2026-08-21T08:32:15.8219314Z 
2026-08-21T08:32:15.8219559Z   36 | >>>     && python manage.py collectstatic --noinput --clear \
2026-08-21T08:32:15.8219958Z 
2026-08-21T08:32:15.8220112Z   37 | >>>     && rm .env-sample .env \
2026-08-21T08:32:15.8220387Z 
2026-08-21T08:32:15.8220639Z   38 | >>>     && find /usr/src/static -type f -exec gzip -9 --keep {} +
2026-08-21T08:32:15.8221028Z 
2026-08-21T08:32:15.8221152Z   39 |     
2026-08-21T08:32:15.8221323Z 
2026-08-21T08:32:15.8221446Z --------------------
2026-08-21T08:32:15.8221646Z 
2026-08-21T08:32:15.8223176Z failed to solve: process "/bin/sh -c cp .env-sample .env     && python manage.py collectstatic --noinput --clear     && rm .env-sample .env     && find /usr/src/static -type f -exec gzip -9 --keep {} +" did not complete successfully: exit code: 1