Merge pull request #51004 from zhouhaibing089/rsync-fix

Automatic merge from submit-queue (batch tested with PRs 51666, 49829, 51058, 51004, 50938)

add the caller ip into rsync hosts allow list

fixes https://github.com/kubernetes/kubernetes/issues/51003.

This patch allows running build in pods.

```release-note
NONE
```

build/build-image/rsyncd.sh

@@ -72,7 +72,7 @@ port = 8730
   numeric ids = true
   $USER_CONFIG
   hosts deny = *
-  hosts allow = ${ALLOW}
+  hosts allow = ${ALLOW} ${ALLOW_HOST-}
   auth users = k8s
   secrets file = ${SECRETS}
   read only = false

build/common.sh

@@ -617,6 +617,7 @@ function kube::build::start_rsyncd_container() {
   V=3 kube::log::status "Starting rsyncd container"
   kube::build::run_build_command_ex \
     "${KUBE_RSYNC_CONTAINER_NAME}" -p 127.0.0.1:${KUBE_RSYNC_PORT}:${KUBE_CONTAINER_RSYNC_PORT} -d \
+    -e ALLOW_HOST="$(ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1')" \
     -- /rsyncd.sh >/dev/null
 
   local mapped_port