nodepool: pause opensuse-15 builds
These builds are constantly failing (logs at [1], [2]) so pending
investigation, pause the builds to avoid filling the builders.
[1]
[2]
@@ -246,7 +246,9 @@ diskimages:
- name: opensuse-15
parent: base
- pause: false
+ # NOTE(ianw): Paused 2020-12-18 due to persistent build failures
+ # pending investigation
+ pause: true
elements:
- opensuse-minimal
- cache-devstack
