* Update list of gpg keys
from https://github.com/nodejs/node#release-team
The former first key no longer seems to exist on the keyservers.
* Update gpg keys in other templates
- Support `s390x` in all of the version except 4.8 and the following
variants: default, alpine, stretch and onbuild
- Generate proper `architectures` for the stackbrew
- Update `update.sh` in order to be used on s390x
- `s390` is not supported in v4.8, therefore, add a local architectures
under 4.8 and remove `s390x` there
Signed-off-by: Yihong Wang <yh.wang@ibm.com>
* Add stretch variant
This is the first step to transitioning over to stretch for the base
images
* Update for Node.js 8.2.1
Also updates yarn to 0.27.5
* Include arch updates from #452
* Add stretch to x64
* Add stretch to ppc64le architecture