hack/local-up-karmada.sh脚本执行时，dockerfile无法安装 apk add --no-cache ca-certificates

[hamstersox]

STEP 4/7: RUN apk add --no-cache ca-certificates
fetch https://dl-cdn.alpinelinux.org/alpine/v3.21/main/aarch64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.21/community/aarch64/APKINDEX.tar.gz
WARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.21/main: could not connect to server (check repositories file)
WARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.21/community: could not connect to server (check repositories file)
ERROR: unable to select packages:
ca-certificates (no such package):
required by: world[ca-certificates]