describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Optimize git clone performance in GitHub Action by replacing deep fetches with time-limited shallow clones.
Main changes:

• Replaced --deepen=$ALL with --shallow-since="6 months ago" for git fetch operations
• Removed unnecessary ALL=2147483647 variable declaration
• Maintained the same branch checkout workflow with optimized fetch strategy

Generated by LinearB AI and added by gitStream.
_{AI-generated content may contain inaccuracies. Please verify before using.
💡 Tip: You can customize your AI Description using Guidelines Learn how}