Detect malformed github variable declarations

[karlbrown-va]

Hi, we recently had a situation where we had a variable like this:
thing: $ {{ thing2.thing3 }}

(Notice space between $ and { )

Is this type of malformed variable something actionlint could detect as a warning?

Also a small suggestion, have you considered enabling the 'discussions' tab so that people can open topics for discussion like the above w/o necessarily saying something is an issue?

thanks!