fickit: add helper script to simplify nsenter

fickit-backend.yml

@@ -237,6 +237,9 @@ services:
     binds:
       - /etc/hosts:/etc/hosts:ro
       - /root/.ssh/:/root/.ssh/:ro
+      - /usr/bin/iptables:/usr/bin/iptables:ro
+      - /usr/bin/mysql:/usr/bin/mysql:ro
+      - /usr/bin/pnsenter:/usr/bin/pnsenter:ro
       - /var/lib/fic/outofsync:/var/lib/fic/outofsync
       - /var/lib/fic/raw_files:/mnt/fic
     capabilities:
@@ -280,6 +283,16 @@ files:
     source: configs/id_ed25519
     mode: "0400"
 
+  - path: usr/bin/iptables
+    source: configs/nsenter_iptables.sh
+    mode: "0755"
+  - path: usr/bin/mysql
+    source: configs/nsenter_mysql.sh
+    mode: "0755"
+  - path: usr/bin/pnsenter
+    source: configs/nsenter_process.sh
+    mode: "0755"
+
   - path: etc/mysql/conf.d/max-conn.cnf
     contents: |
       [mysqld]