Feature request: Check length of run statement.

[joernott]

Today, I got the following issue on a lenghty run statement (basically a long cat <<EOF outputting a list ov variables):

The workflow is not valid. In .github/workflows/dispatch_dev_module.yml (Line: 20, Col: 11): Error from called workflow oxid-eSales/github-actions/.github/workflows/call-module-development.yml@v0 (Line: 87, Col: 14): Exceeded max expression length 21000

This went undetected by actionlint. It would be a nice feature to have it detected.