docs: Slack bots

SLACK.md

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+## Slack bots
+### Doorboy3
+https://api.slack.com/apps/A05NDB6FVJQ
+Slack app author: rasmus
+
+Managed by inventory-app:
+- Incoming (open-commands) to `/api/slack/doorboy`, inventory-app authorizes based on command originating from #members or #work-shop && oidc access group (floor, workshop).
+- Posts logs to a private channel. Restricted to 193.40.103.0/24.
+
+Secrets as `SLACK_DOORLOG_CALLBACK` and `SLACK_VERIFICATION_TOKEN`.
+
+### oidc-gateway
+https://api.slack.com/apps/A05DART9PP1
+Slack app author: eaas
+
+Managed by passmower:
+- Links e-mail to slackId.
+- Login via Slack (not enabled).
+
+Secrets as `slackId` and `slack-client`.
+
+### podi-podi uuenduste spämmikoobas
+https://api.slack.com/apps/A033RE9TUFK
+Slack app author: rasmus
+
+Posts Prometheus alerts to a private channel.
+
+Secret as `slack-secrets`.