Feature request: Check that globs in on.*.paths match at least one file

[allanlewis]

It would be useful to me if Actionlint could report when globs in on.*.paths don't match any files.

The following shell pipeline approximates what I'd like to do:

git ls-files -- '.github/workflows/*.yml' \
  | parallel "yq -o json {} | jq -r '.on | to_entries[].value | .paths // empty | .[]' 2>/dev/null" \
  | sort -u \
  | parallel -k --bar --tag "git ls-files --error-unmatch :{} >/dev/null"

However, this obviously uses Git's pattern syntax which probably differs from GitHub's in some subtle respects.