chore(justfile): just setup should not fail on git-clean

[noelmcloughlin]

This PR prevents just setup failure if git tree is clean

(Maybe there is other solution via refactoring).

(my-awesome-schema)  just clean; just setup
removing "project/graphql"
rm -rf tmp
rm -rf docs/elements/*.md
Project-status: Ok
git init
Reinitialized existing Git repository in ./myproject/.git/
uv sync --group dev
Resolved 199 packages in 0.79ms
Audited 175 packages in 1ms
git add .
git commit -m "Initialise git with minimal project" -a
On branch main
nothing to commit, working tree clean
error: Recipe `setup` failed on line 52 with exit code 1