freebsd-pkg: Fix build

Author: taoky

freebsd-pkg/Dockerfile

@@ -1,4 +1,3 @@
 FROM ustcmirror/curl-helper
 LABEL maintainer="Yifan Gao docker@yfgao.com"
-RUN apk add --no-cache rsync parallel gawk sed xz tar jq bash zstd python3
-ADD sync.sh scan_and_clean_mismatched_files.py /
+RUN apk add --no-cache rsync parallel gawk sed xz tar jq bash zstd