Persist images for all targets (#1097)

When building the Sonobuoy images, we build images for multiple targets.
We push them in a separate step from where they were built so they need
to be persisted to the workspace. We were previously only persisting the
sonobuoy/sonobuoy tagged images, not the sonobuoy/sonobuoy-ARCH images.
This was causing CI failures as the image pushing step was trying to
push images for different architectures that did not exist locally.

Signed-off-by: Bridget McErlean <bmcerlean@vmware.com>

.circleci/config.yml

@@ -67,7 +67,7 @@ jobs:
  - run:
  name: Save as tar files to persist to next step
  command: |
- docker save -o sonobuoyImages.tar.gz sonobuoy/sonobuoy
+ docker save -o sonobuoyImages.tar.gz sonobuoy/sonobuoy sonobuoy/sonobuoy-amd64 sonobuoy/sonobuoy-arm64
  - persist_to_workspace:
  root: /home/circleci/project
  paths: