ci: Pull Fedora from api.ci

[cgwalters]

Currently we pull from quay.io and api.ci, and the Fedora registry
is being very flaky. I set up a mirror on api.ci for now.

[jlebon]

/lgtm

[openshift-ci-robot]

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[jlebon]

   upgrades: Trying to pull registry.svc.ci.openshift.org/coreos/fedora:31...
   upgrades: Getting image source signatures
   upgrades:   Error fetching blob: invalid status code from registry 404 (Not Found)
   upgrades: Error: unable to pull registry.svc.ci.openshift.org/coreos/fedora:31: unable to pull image: Error reading blob sha256:a7fc14226e67b8303c32a1287dbea5ea5e240e8476f6e54a2d0ae54b35597848: Error fetching blob: invalid status code from registry 404 (Not Found)

Hmm weird, it works locally. Maybe it wasn't set up yet when it ran? Anyway, I'm going to override it because I really want to get #1997 in and the only thing that flaked is upgrade and we know that test is fine since it passed in #1997, which is also using the f31 image.

/override continuous-integration/jenkins/pr-merge

[openshift-ci-robot]

@jlebon: Overrode contexts on behalf of jlebon: continuous-integration/jenkins/pr-merge

In response to this:

  upgrades: Trying to pull registry.svc.ci.openshift.org/coreos/fedora:31...
  upgrades: Getting image source signatures
  upgrades:   Error fetching blob: invalid status code from registry 404 (Not Found)
  upgrades: Error: unable to pull registry.svc.ci.openshift.org/coreos/fedora:31: unable to pull image: Error reading blob sha256:a7fc14226e67b8303c32a1287dbea5ea5e240e8476f6e54a2d0ae54b35597848: Error fetching blob: invalid status code from registry 404 (Not Found)

Hmm weird, it works locally. Maybe it wasn't set up yet when it ran? Anyway, I'm going to override it because I really want to get #1997 in and the only thing that flaked is upgrade and we know that test is fine since it passed in #1997, which is also using the f31 image.

/override continuous-integration/jenkins/pr-merge

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[cgwalters]

This one failed too with a 404. Weird. I can pull it from outside just fine.

And I can also

oc run -i -t walters-sh --image=registry.svc.ci.openshift.org/coreos/fedora:31 --restart=Never
If you don't see a command prompt, try pressing enter.
bash-5.0$ 

just fine.

I wonder if this is possibly related to qemu usermode networking?

[cgwalters]

I think a pattern we should enable BTW is having mantle inject content (including container images) from the host.