Previous to this change official descheduler container images only
supported the AMD64 hardware architecture. This change enables
building official descheduler container images for multiple
architectures.
The initially supported architectures are AMD64 and ARM64.
Prior to this change the output from the command "descheduler version"
when run using the official container images from k8s.gcr.io would
always output an empty string. See below for an example.
```
docker run k8s.gcr.io/descheduler/descheduler:v0.19.0 /bin/descheduler version
Descheduler version {Major: Minor: GitCommit: GitVersion: BuildDate:2020-09-01T16:43:23+0000 GoVersion:go1.15 Compiler:gc Platform:linux/amd64}
```
This change makes it possible to pass the descheduler version
information to the automated container image build process and
also makes it work for local builds too.
The kubernetes project has been updated to use Go 1.14.4. See below pull
request.
https://github.com/kubernetes/kubernetes/pull/88638
After making the updates to Go 1.14 "make gen" no longer worked. The
file hack/tools.go had to be created to get "make gen" working with Go
1.14.
Run below commands to build and push
a staging image to staging-k8s.gcr.io.
```
$ make push
```
Run below commands to build and push
a release image to k8s.gcr.io.
```
$ git checkout v0.9.0
$ VERSION=v0.9.0 REGISTRY=k8s.gcr.io make push
```
By setting up a multistage Docker build, we can create the container
image in a single command. This eliminates external setup and allows us
to build this automatically on registries.
