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Prepare C# Payjoin 0.1.0+payjoin-1.0.0 for NuGet #279

	name: Formatting

	on: [push, pull_request]

	jobs:
	Format:
	runs-on: ubuntu-26.04
	steps:
	- name: "Checkout repo"
	uses: actions/checkout@v6
	- name: Set up nix
	uses: ./.github/actions/setup-nix
	- name: Run treefmt
	run: \|
	set -eo pipefail
	nix fmt -- --ci \|\| {
	echo "❌ Code is not formatted. Showing diff:"
	git --no-pager diff
	exit 1
	}