Add -summary flag for aggregate error count output#697
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When -summary is passed, actionlint prints a single aggregate line to stderr after checking: 'N errors in M file(s)'. This is useful for CI status checks, badges, and dashboard integrations that need a stable one-line summary without parsing the human-readable error layout. The summary composes with -oneline, -format, -no-color, and all other flags. Exit codes are unchanged. Fixes rhysd#691
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Description
Adds a -summary flag that prints one aggregate line to stderr after checking: N errors in M file(s).
Problem
When integrating actionlint into CI status checks, status badges, or pre-commit hooks, there is no built-in way to get a single-line aggregate summary — users currently have to pipe -oneline output through wc -l to count errors.
Solution
Implementation
~10 lines in command.go: count the returned []*Error, group by Filepath, and print the aggregate after
unLinter returns.
Fixes #691