opinionate private IP of the internal LB

Tiltfile

@@ -388,6 +388,13 @@ def deploy_worker_templates(template, substitutions):
     yaml = shlex.quote(yaml)
     flavor_name = os.path.basename(flavor)
     flavor_cmd = "RANDOM=$(bash -c 'echo $RANDOM')"
+
+    apiserver_lb_private_ip = os.getenv("AZURE_INTERNAL_LB_PRIVATE_IP", "")
+    if "windows-apiserver-ilb" in flavor and apiserver_lb_private_ip == "":
+        flavor_cmd += "; export AZURE_INTERNAL_LB_PRIVATE_IP=40.0.11.100"
+    elif "apiserver-ilb" in flavor and apiserver_lb_private_ip == "":
+        flavor_cmd += "; export AZURE_INTERNAL_LB_PRIVATE_IP=30.0.11.100"
+
     flavor_cmd += "; export CLUSTER_NAME=" + flavor.replace("windows", "win") + "-$RANDOM; echo " + yaml + "> ./.tiltbuild/" + flavor + "; cat ./.tiltbuild/" + flavor + " | " + envsubst_cmd + " | " + kubectl_cmd + " apply -f -"
     flavor_cmd += "; echo \"Cluster \'$CLUSTER_NAME\' created, don't forget to delete\""