[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3541: CircleCI cannot find context "dockerhub-auth"

[Tahoe-LAFS]

#3541: CircleCI cannot find context "dockerhub-auth"
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 Reporter:  sajith              |          Owner:
     Type:  defect              |         Status:  new
 Priority:  normal              |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  n/a
 Keywords:                      |  Launchpad Bug:
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 In #3483, we added a "dockerhub-auth" context which holds !DockerHub
 credentials to tahoe-lafs' CircleCI settings, in order to solve the
 problem imposed by !DockerHub's impending rate limits.  It turns out that
 having an organization-specific context will prevent CircleCI from running
 CI tasks for pull requests made by contributors who have chosen to fork
 tahoe-lafs repository at !GitHub.

 Here is an example CI run:
 https://app.circleci.com/pipelines/github/jaraco/tahoe-lafs/23/workflows
 /e2869d9c-43c7-4475-9aac-690826136eb7.  All of those failed tasks have
 failed with the same "could not find context" error message.

 This happens because the tahoe-lafs organization's CircleCI account has a
 "dockerhub-auth" context, but any other account that forked the repository
 won't have such a context, unless they add one at CircleCI.  This is the
 source of those errors, and it could be pretty confusing.

 A solution would be for the account that forked the repository to create a
 "dockerhub-auth" context (an empty context will do) under CircleCI's
 "organization settings".

 An even better solution would be to adapt our CircleCI configuration such
 that it will continue to work even when a "dockerhub-auth" context is not
 present.  In such cases, CI should continue to function, even if
 !DockerHub rate-limits image pulls.  This way new contributors won't need
 to have commit access to the "canonical" tahoe-lafs repository.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3541>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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