How to build job with file parameter?

```
public QueueReference build(Map params) throws IOException {
...
```
Seems only support `String` parameter.

Start at the build(Map) entry point shown in the issue and inspect how job parameters are represented and sent. Determine the Jenkins job-build API's expected file-parameter input, then verify that a job can be built with a file parameter alongside string parameters.

Written by the indexing model from the issue text.