fix: run uv lock before pushing example code

[coretl]

This will normally be done by pre-commit or the devcontainer when people make a project from the copier template, but we need to do it manually here

[callumforrester]

If we also want this to be done by a precommit/devcontainer shall we put it in a script so it is the same everywhere and doesn't need to be maintained in two places?

Also I am a bit disappointed that there isn't just a uv init command that does most of this...?

[coretl]

If we also want this to be done by a precommit/devcontainer shall we put it in a script so it is the same everywhere and doesn't need to be maintained in two places?

Also I am a bit disappointed that there isn't just a uv init command that does most of this...?

All that the devcontainer needs to do is uv sync. The same for pre-commit. The only issue for the example template is that both of those require building the module, which setuptools_scm requires is in a git repo. Hence the annoying stages here...