Bump package indices #183

	name: Bump package indices

	on:
	workflow_dispatch: # allows manual triggering
	schedule:
	- cron: '14 3 * * 0' # runs weekly on Sunday at 03:14 UTC

	jobs:
	lockfile:
	runs-on: ubuntu-latest
	permissions:
	contents: write
	pull-requests: write
	steps:
	- name: Checkout repository
	uses: actions/checkout@v7

	- name: Install Nix
	uses: cachix/install-nix-action@v31
	with:
	extra_nix_config: \|
	accept-flake-config = true

	- name: Update flake.lock
	env:
	TARGET_BRANCH: ${{ github.ref_name }}
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	set -x

	# See https://github.com/orgs/community/discussions/26560 and https://github.com/actions/checkout/issues/13
	git config user.name "github-actions[bot]"
	git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

	git checkout -b update-flake-inputs

	nix flake update CHaP hackage-nix \
	--commit-lock-file --commit-lockfile-summary 'Update CHaP and hackage-nix flake inputs'

	git push -fu origin update-flake-inputs
	git fetch origin "$TARGET_BRANCH:refs/remotes/origin/$TARGET_BRANCH"

	if EXISTING_PR=$(gh pr view update-flake-inputs --json number --jq .number)
	then
	gh pr edit "$EXISTING_PR" -b "$(git log -1 --format='%b')"
	else
	gh pr create -B "$TARGET_BRANCH" --fill-first -l dependencies,automated
	fi

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