Drone: Drone needs a way to force refresh of an image (e.g plugin or build)

[tooda02]

Drone appears to keep a Docker image cache. This is beneficial for performance, but is a problem when a plugin or a build box image has been updated and Drone continues to use the old version. There needs to be some way to ask Drone to remove an image from its cache, either through the UI or REST API.

[bradrydzewski]

@tooda02 plugins always auto-upgrade. Build or compose images can force upgrade by adding the pull option in the yaml:

build:
  image: foo
  pull: true

In terms of image buildup on the machine, we do plan to add some sort of PRE_BUILD and POST_BUILD plugin that executes a generic job on the host machine when the build completes. We won't provide a solution for cleanup specifically, but will will provide the capability to launch the job. You can see more about the discussion here:
https://github.com/drone/drone/issues/1193#issuecomment-150843153

If you don't mind let's use Gitter for these sort of questions. thanks!!

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