Fix drone filter func

[appleboy]

As title. cc @bradrydzewski

[appleboy]

@bradrydzewski need you take this PR. I will write the blog post to introduce the drone filter feature. 👍

[appleboy]

ping @bradrydzewski

[appleboy]

Hi @bradrydzewski can you take look at this? thanks.

[tboerger]

Without this the agent filter is broken, right?

[appleboy]

@tboerger Yes.

[gvishnutej]

@tboerger @appleboy Any ETA when this PR will be merged? we want to use filter feature on drone agents

[appleboy]

@gvishnutej I don't have permission to merge this PR. I can verify this PR resolve the filter issue.

[bradrydzewski]

sorry the delay on my end. I think eventually we will use a different (e.g. simpler) mechanism for routing jobs to different agents. So you should expect the filter to eventually be replaced, but that won't happen for a few months.

[gvishnutej]

@bradrydzewski Thanks for merging this fix. I see that drone:latest docker image has this change. Is there a plan to release a new version of drone with this fix?

[geekdave]

@appleboy does this allow running certain jobs on certain agents? any quick example you could share, or link to a blog post? Been hoping for this feature! Thanks for your time on this!

[appleboy]

@geekdave see the @bradrydzewski comment #2200 (comment)