Set up multistage Docker build.

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.

Dockerfile.dev

@@ -0,0 +1,20 @@
+# Copyright 2017 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+FROM scratch
+
+MAINTAINER Avesh Agarwal <avagarwa@redhat.com>
+
+COPY _output/bin/descheduler /bin/descheduler
+
+CMD ["/bin/descheduler", "--help"]