in a kubernetes Deployment yaml file is there a simple way to run multiple commands in the postStart hook of a container?

I'm trying to do something like this:

lifecycle:
  postStart:
    exec:
      command: ["/bin/cp", "/webapps/myapp.war", "/apps/"]
      command: ["/bin/mkdir", "-p", "/conf/myapp"]
      command: ["touch", "/conf/myapp/ready.txt"]

But it doesn't work. (looks like only the last command is executed)

I know I could embed a script in the container image and simply call it there... But I would like to be able to customize those commands in the yaml file without touching the container image.

thanks