[FIX] Headers not carried over by `math_img` (#4337) #7

	---
	name: f strings

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- '*'

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	f_strings:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout nilearn
	uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.12'
	allow-prereleases: false

	- name: Install flynt
	shell: bash {0}
	run: python -m pip install --upgrade pip flynt

	- name: Run flynt
	run: flynt .

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