Ian Wienand 043a4258fc Dockerfile: use local openstack-ci-core PPA key
We see timeouts trying to get this key fairly frequently in the gate.
Store it locally and use that in the container build.

Change-Id: Ifd706849f1fad88c8ec4afc79090df4afb88abb4
2020-04-30 17:32:02 +10:00
..
2017-03-13 13:42:43 -04:00