Fix SIGPIPE error in detect_changes when many files changed

Dan Notesteinrequested to merge
fix/detect-changes-sigpipe into develop

Summary

When thousands of files change (common in repos with many test files like hivemind), piping to head -50 causes SIGPIPE (exit code 141) when echo tries to write more data after head has closed the pipe.

Problem 

echo "$CHANGED_FILES" | head -50  # SIGPIPE if CHANGED_FILES has >50 lines

This was causing hivemind MR !956 pipeline to fail in the detect_changes job.

Fix

Add || true to suppress the SIGPIPE error:

echo "$CHANGED_FILES" | head -50 || true

Also added total file count when output is truncated for better visibility.

Test

  • Retry hivemind MR !956 pipeline after merge

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