[Buildbot] #3459: publish built on Travis docs for each pull request

[Buildbot trac]

#3459: publish built on Travis docs for each pull request
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Reporter:  rutsky  |       Owner:
    Type:  task    |      Status:  new
Priority:  major   |   Milestone:  0.9.+
 Version:          |  Resolution:
Keywords:          |
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Comment (by rutsky):

 I think not working artifacts in PR is a security feature: looks like
 private environment variables like `ARTIFACTS_SECRET` are actual
 environment variables during all steps that run inside Travis VM, so
 malicious can add step like `echo $ARTIFACTS_SECRET` in his PR to steal
 credentials.

 Looks like !AppVeyor allows artifacts upload for pull requests:
 http://help.appveyor.com/discussions/problems/2646-pull-requests-always-
 create-artifacts-potentially-letting-users-download-malicious-code
 but they don't decrypt secret env. variables in PRs, so there is no way to
 use it in PRs without exposing credentials.

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Ticket URL: <http://trac.buildbot.net/ticket/3459#comment:6>
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