fix(workflow): clear cilium does not exist error (#43)

Author: jianxiaoguo

_scripts/uninstall.sh

@@ -2,10 +2,25 @@
 set -eo pipefail
 shopt -s expand_aliases
 
-ip link delete cilium_host
-ip link delete cilium_net
-ip link delete cilium_vxlan
-ip link delete nodelocaldns
+ip link show cilium_host > /dev/null 2>&1
+if [[ $? -eq 0 ]] ; then
+    ip link delete cilium_host
+fi
+
+ip link show cilium_net > /dev/null 2>&1
+if [[ $? -eq 0 ]] ; then
+    ip link delete cilium_net
+fi
+
+ip link show cilium_vxlan > /dev/null 2>&1
+if [[ $? -eq 0 ]] ; then
+    ip link delete cilium_vxlan
+fi
+
+ip link show nodelocaldns > /dev/null 2>&1
+if [[ $? -eq 0 ]] ; then
+    ip link delete nodelocaldns
+fi
 
 /usr/local/bin/k3s-killall.sh