fix: add probot auth for reminders

[samuelmaddock]

• Use APP_ID and PRIVATE_KEY to auth reminders, fallback to GITHUB_TOKEN if supplied
• Allow running with/without Slack & GitHub auth
• Log to console when no Slack auth provided

Not entirely sure if this will fix the unauthenticated GH requests, but we do pass these env vars into the other script

zoilist/README.md

Lines 29 to 30 in 59bdffd

	# 2. Start container
	docker run -e APP_ID=<app-id> -e PRIVATE_KEY=<pem-value> zoilist