proposition for #385 -- adding raw commands

[andypetrella]

Hello,

This is a small PR for the issue #385. I did it rather straightforward because it's a rather broad need.

I introduced Raw for a partial script to be included in the Dockerfile then two keys:

• dockerRawWithOriginalUser for commands before USER $daemonUser
• dockerRawWithDaemonUser for commands after USER $daemonUser

FYI: I need it the for my SparkNotebook for which I'd like to be able to map volumes from the host (for instance).
I had a question regarding this and I'm struggling with it for two days, and actually a solution would be to use a less restrictive user.

Note: I'm sure I did it on the right branch (... from master → 0.7, and there is a 0.8 one I see).

tell me what you think
thanks
andy

[lightbend-cla-validator]

Hi @andypetrella,

Thank you for your contribution! We really value the time you've taken to put this together.

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[muuki88]

Thanks for your pull request :) We are currently changing the docker internals here #486
I think you can now achieve your goal with the new exposed API.

dockerCommands := {
  val cmds = dockerCommands.value
  // add, filter, remove docker commands as you like
  cmds
}

The new documentation gives a bit more details.

[andypetrella]

@muuki88 ah great, so should I work on this branch atm?

Also, do you have any mechanism (shortcuts) to create user and to set him the rights to execute the packaged app (a play one in my case)?

Thanks a lot for the information.
andy