Pass config file through spark-submit

[James Starks]

I have a config file that exploits type safe config library located on the 
local file system, and want to submit that file through spark-submit so that 
spark program can read customized parameters. For instance,

my.app {
  db {
    host = domain.cc
    port = 1234
    db = dbname
    user = myuser
    passwd = mypass
  }
}

Spark submit code looks like

    spark-submit --class "my.app.Sample" --master local[*] --conf 
"spark.executor.extraJavaOptions=-Dconfig.file=/path/to/conf/myapp.conf" 
/path/to/my-app.jar

But the program can not read the parameters such as db, user, host, and so on 
in my conf file.

Passing with --files /path/to/myapp.conf doesn't work either.

What is the correct way to submit that kind of conf file so that my spark job 
can read customized parameters from there?

Thanks