Michael Zalimeni 1d9234a87a
ci: sanitize commit message for Slack failure alerts (#19876)
To ensure that shell code cannot be injected, capture the commit message
in an env var, then format it as needed.

Also fix several other issues with formatting and JSON escaping by
wrapping the entire message in a `toJSON` expression.
2023-12-08 16:04:45 -05:00
..