ci: stop rebuilding what has not changed #2210

	# SPDX-FileCopyrightText: © 2025 Phala Network <dstack@phala.network>
	#
	# SPDX-License-Identifier: Apache-2.0

	name: Prek checks

	on:
	push:
	branches: [ next, 'release/**' ]
	pull_request:
	branches: [ next, 'release/**' ]

	permissions:
	contents: read

	jobs:
	prek:
	runs-on: ubuntu-latest
	env:
	RUSTUP_TOOLCHAIN: 1.92.0

	steps:
	- uses: actions/checkout@v5
	with:
	fetch-depth: 0

	- name: Install Rust
	uses: dtolnay/rust-toolchain@master
	with:
	toolchain: 1.92.0
	components: rustfmt

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

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: '1.22'

	- name: Install prek
	run: pip install prek

	- name: Run prek checks (PR)
	if: github.event_name == 'pull_request'
	run: prek run --from-ref ${{ github.event.pull_request.base.sha }} --to-ref ${{ github.event.pull_request.head.sha }} --show-diff-on-failure

	- name: Run prek checks (push)
	if: github.event_name == 'push'
	env:
	BEFORE: ${{ github.event.before }}
	AFTER: ${{ github.event.after }}
	run: \|
	# A push that creates a branch reports an all-zero "before", and a
	# force-push can name one this clone no longer has. Neither is a commit,
	# so the range would be invalid; check every file instead.
	if git rev-parse --verify --quiet "$BEFORE^{commit}" >/dev/null; then
	prek run --from-ref "$BEFORE" --to-ref "$AFTER" --show-diff-on-failure
	else
	echo "no usable base commit ($BEFORE); checking all files"
	prek run --all-files --show-diff-on-failure
	fi

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