fix(ci): SIGPIPE exit 141 when loading PR diff

Author: git-mesome

.github/workflows/pr-auto-description.yml

@@ -39,8 +39,8 @@ jobs:
             if [ -f "$f" ]; then TEMPLATE="$(cat "$f")"; break; fi
           done
 
-          DIFF="$(gh pr diff "$PR_NUMBER" | head -n 800)"
-
+          DIFF="$(gh pr diff "$PR_NUMBER" | sed -n '1,800p')"
+          
           PLACEHOLDER="false"
           echo "$BODY" | grep -q "어떤 작업을 했는지 설명해주세요" && PLACEHOLDER="true"
           echo "$BODY" | grep -q "주요 변경 사항 1" && PLACEHOLDER="true"