Add call reminder workflow pinging @EEST 1h before calls

[spencer-tb]

Pings @eest ~1h before each call mapped in .github/calls.yml. Times and Meet links are read live from the calendar, so reschedules and cancellations track themselves. Posts as a Discord bot from a 15-minute GitHub Actions cron.

Config (Settings → Secrets and variables → Actions)

Name	Kind	Value
DISCORD_BOT_TOKEN	secret	bot token
CALENDAR_ICS_URL	secret	calendar secret iCal address (comma-separate for >1 feed)
DISCORD_CHANNEL_ID	variable	target channel ID
EEST_ROLE_ID	variable	default role to ping

Edit .github/calls.yml to map event titles → ping wording (and optional per-call role).

Notes

• Make @eest mentionable, or grant the bot "Mention All Roles", or the ping won't notify.
• Scheduled runs only fire from the default branch.