Job arguments get appended on each execution

[mindscratch]

A docker based job that has a command and arguments defined has its arguments field appended to each time the job runs. For example:

{
  "name": "hello",
  "container": {
    "type": "DOCKER",
    "image": "myimage"
    },
    "command": "/myapp",
    "arguments": ["--foo --bar"]
}

After the first run, if you look at the job configuration the arguments are now:

"arguments": ["--foo --bar", "--foo --bar"]

Each execution appends the arguments again and again.