HF Space keepalive #225

	name: HF Space keepalive

	# Free HF Spaces fall asleep after a stretch of inactivity, and the
	# first visitor after a sleep waits 30 to 60 seconds for the container
	# to boot. That looks broken from a tweet. A light curl every 4 hours
	# keeps the Space warm without burning meaningful GH Actions minutes
	# (~6 runs per day, a few seconds each).

	on:
	schedule:
	- cron: "0 /4 * *"
	workflow_dispatch:

	concurrency:
	group: hf-space-keepalive
	cancel-in-progress: false

	jobs:
	ping:
	runs-on: ubuntu-latest
	timeout-minutes: 2
	steps:
	- name: Wake leaderboard Space
	run: \|
	code=$(curl -sLm 60 -o /dev/null -w "%{http_code}" \
	"https://openchainbench-leaderboard.hf.space")
	echo "leaderboard: $code"
	# 200 is a hot hit. 503 means HF is still booting the
	# container, which is exactly the case we are warming for, so
	# don't fail the workflow on it.
	case "$code" in
	200\|302\|503) exit 0 ;;
	*) exit 1 ;;
	esac

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