Generated CI produces mis-aligned YAML

[jsstevenson]

Bug Description

The generated GitHub Actions yaml which uses the relatively new Python 3.13t logic includes a little extra indentation, making it invalid. See for example lines 51-57 in this gist:

https://gist.github.com/jsstevenson/71c529f2227b4484cf1e1c19f92b43c9#file-maturin_generated_ci-yaml-L51-L57

(it's also misaligned in the other places where this code is reused)

Your maturin version (maturin --version)

1.7.6

Your Python version (python -V)

3.12.2

Your pip version (pip -V)

24.3.1

What bindings you're using

pyo3

Does cargo build work?

• Yes, it works

If on windows, have you checked that you aren't accidentally using unix path (those with the forward slash /)?

• Yes

Steps to Reproduce

maturin generate-ci github -o release.yaml to generate the gist linked above