fix: add linux headers for busybox build

.gitea/workflows/iperf3.yml

@@ -6,7 +6,8 @@ on:
       - main
     paths:
       - .gitea/workflows/iperf3.yml
-      - scripts/**
+      - scripts/build_iperf3.sh
+      - scripts/publish_release.py
       - versions/iperf3.version
       - README.md
   workflow_dispatch:

scripts/build_busybox.sh

@@ -7,7 +7,7 @@ PREFIX_NAME="busybox-${VERSION}-linux-amd64-musl-static"
 
 mkdir -p "$OUTPUT_DIR"
 
-apk add --no-cache   build-base   bzip2   curl   file   tar   xz
+apk add --no-cache   build-base   bzip2   curl   file   linux-headers   tar   xz
 
 SRCDIR="${TMPDIR:-/tmp}/busybox-src-${VERSION}"
 rm -rf "$SRCDIR"