docs: add guide on handling unmatched formatters #312

	name: Update gomod2nix.toml
	on: pull_request

	permissions:
	contents: write

	jobs:
	renovatebot:
	runs-on: ubuntu-latest
	if: ${{ github.actor == 'renovate[bot]' }}
	steps:
	- uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	fetch-depth: 0
	- name: Install Nix
	uses: cachix/install-nix-action@v30
	with:
	github_access_token: ${{ secrets.GH_TOKEN_FOR_UPDATES }}
	nix_path: nixpkgs=channel:nixos-unstable
	- name: Update gomod2nix.toml
	run: \|
	nix develop .#renovate --command bash -c "gomod2nix:update"
	# git push if we have a diff
	if [[ -n $(git diff) ]]; then
	git add nix/packages/treefmt/gomod2nix.toml
	git config --global user.email "<29139614+renovate[bot]@users.noreply.github.com>"
	git config --global user.name "renovate[bot]"
	git commit -m "chore: update gomod2nix.toml"
	git push origin HEAD:${{ github.head_ref }}
	fi

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