split out client image and switch to sdkmanager
more info in the commit messages. Once this is merged, built, and deployed to the registry, then fdroidclient's and privileged-extension's gitlab-ci.yml need to be updated to use this.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
more info in the commit messages. Once this is merged, built, and deployed to the registry, then fdroidclient's and privileged-extension's gitlab-ci.yml need to be updated to use this.