fix(ci): 修复发布说明生成逻辑

Author: Delusions6515

.github/workflows/build.yml

@@ -220,6 +220,7 @@ jobs:
                 while ((getline line < "release-notes.md") > 0) replacement = replacement line ORS
                 close("release-notes.md")
               }
+              !seen++ && $0 !~ /^##[[:space:]]+What.s Changed[[:space:]]*$/ { printf "%s\n", replacement }
               /^##[[:space:]]+What.s Changed[[:space:]]*$/ {
                 if (!found) printf "%s", replacement
                 found = 1
@@ -228,6 +229,7 @@ jobs:
               }
               in_changed && /^##[[:space:]]/ { in_changed = 0 }
               !in_changed { print }
+              END { if (!seen) printf "%s", replacement }
             ' current-release-notes.md > merged-release-notes.md
             gh release edit "$TAG" "${args[@]}" --notes-file merged-release-notes.md
           else