fix: validate snapshot hint and CRC invariants #7966

	name: Validate PR Body

	on:
	pull_request:
	# synchronize is required: validate-body is a required check, and required checks must
	# re-report on every new head SHA or the PR blocks on "Expected, waiting for status".
	types: [opened, edited, reopened, synchronize]
	merge_group:

	jobs:
	validate-body:
	runs-on: ubuntu-latest
	steps:
	- name: Validate PR Body
	shell: bash
	env:
	GH_TOKEN: ${{ github.token }}
	REPO: ${{ github.repository }}
	EVENT_NAME: ${{ github.event_name }}
	PR_NUMBER: ${{ github.event.pull_request.number }}
	PR_BODY: ${{ github.event.pull_request.body }}
	MERGE_GROUP_REF: ${{ github.event.merge_group.head_ref }}
	run: \|
	set -euo pipefail

	# merge_group runs don't have github.event.pull_request, so fetch the body from the PR
	# referenced by the merge queue ref (refs/heads/gh-readonly-queue/<base>/pr-<NUMBER>-<sha>).
	if [[ "$EVENT_NAME" == "merge_group" ]]; then
	PR_NUMBER=$(sed -nE 's/.\/pr-([0-9]+)-./\1/p' <<< "$MERGE_GROUP_REF")
	if [[ -z "$PR_NUMBER" ]]; then
	echo "::error::could not parse a PR number from merge_group ref '$MERGE_GROUP_REF'"
	exit 1
	fi
	PR_BODY=$(gh pr view "$PR_NUMBER" --repo "$REPO" --json body --jq '.body // ""')
	fi

	echo "Validating body of PR #${PR_NUMBER} (event: ${EVENT_NAME})"
	echo "::group::PR body being validated"
	printf '%s\n' "$PR_BODY"
	echo "::endgroup::"

	if LC_ALL=C grep -q '[^[:print:][:space:]]' <<< "$PR_BODY"; then
	echo "PR body contains non-ascii characters. Please remove them."
	exit 1
	else
	echo "PR body contains ascii characters only"
	fi

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