Push builder image to dockerhub (#1037)

Signed-off-by: Alexander Wels <awels@redhat.com>

.travis.yml

@@ -45,7 +45,7 @@ before_deploy:
 deploy:
   # Release :latest images
 - provider: script
-  script: make publish
+  script: make builder-push && make publish
   skip_cleanup: true
   on:
     branch: master

Makefile

@@ -119,3 +119,6 @@ bazel-push-images: bazel-cdi-generate bazel-build
 
 push: bazel-push-images
 
+builder-push:
+	./hack/build/bazel-build-builder.sh
+

hack/build/bazel-build-builder.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+#Copyright 2019 The CDI 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.
+
+set -e
+script_dir="$(readlink -f $(dirname $0))"
+source "${script_dir}"/common.sh
+source "${script_dir}"/config.sh
+
+BUILDER_SPEC="${BUILD_DIR}/docker/builder"
+
+#TODO remove me and use the one from config.sh
+BUILDER_TAG="kubevirt/kubevirt-cdi-bazel-builder"
+
+# Build the encapsulated compile and test container
+(cd ${BUILDER_SPEC} && docker build --tag ${BUILDER_TAG} .)
+echo "Image: ${BUILDER_TAG}"
+
+docker push ${BUILDER_TAG}