Bump golang and default metrics-server version

Signed-off-by: Brad Davidson <[email protected]>

Dockerfile

@@ -1,5 +1,5 @@
 ARG UBI_IMAGE=registry.access.redhat.com/ubi7/ubi-minimal:latest
-ARG GO_IMAGE=rancher/hardened-build-base:v1.16.4b7
+ARG GO_IMAGE=rancher/hardened-build-base:v1.16.7b7
 FROM ${UBI_IMAGE} as ubi
 FROM ${GO_IMAGE} as builder
 # setup required packages
@@ -14,18 +14,28 @@ RUN set -x \
 # setup the build
 ARG PKG="github.com/kubernetes-incubator/metrics-server"
 ARG SRC="github.com/kubernetes-sigs/metrics-server"
-ARG TAG="v0.3.7"
+ARG TAG="v0.5.0"
 RUN git clone --depth=1 https://${SRC}.git $GOPATH/src/${PKG}
 WORKDIR $GOPATH/src/${PKG}
 RUN git fetch --all --tags --prune
 RUN git checkout tags/${TAG} -b ${TAG}
-RUN GO111MODULE=off \
+RUN if echo ${TAG} | grep -qE '^v0\.3\.'; then \
+    GO111MODULE=off \
     go run vendor/k8s.io/kube-openapi/cmd/openapi-gen/openapi-gen.go --logtostderr \
     -i k8s.io/metrics/pkg/apis/metrics/v1beta1,k8s.io/apimachinery/pkg/apis/meta/v1,k8s.io/apimachinery/pkg/api/resource,k8s.io/apimachinery/pkg/version \
     -p ${PKG}/pkg/generated/openapi/ \
     -O zz_generated.openapi \
     -h $(pwd)/hack/boilerplate.go.txt \
-    -r /dev/null
+    -r /dev/null; \
+    else \
+    go install -mod=readonly k8s.io/kube-openapi/cmd/openapi-gen && \
+    ${GOPATH}/bin/openapi-gen --logtostderr \
+    -i k8s.io/metrics/pkg/apis/metrics/v1beta1,k8s.io/apimachinery/pkg/apis/meta/v1,k8s.io/apimachinery/pkg/api/resource,k8s.io/apimachinery/pkg/version \
+    -p ${PKG}/pkg/generated/openapi/ \
+    -O zz_generated.openapi \
+    -h $(pwd)/scripts/boilerplate.go.txt \
+    -r /dev/null; \
+    fi
 RUN GO111MODULE=off \
     GO_LDFLAGS="-linkmode=external \
     -X ${PKG}/pkg/version.Version=${TAG} \

Makefile

@@ -10,7 +10,7 @@ ORG ?= rancher
 # but still refers internally to github.com/kubernetes-incubator/metrics-server packages
 PKG ?= github.com/kubernetes-incubator/metrics-server
 SRC ?= github.com/kubernetes-sigs/metrics-server
-TAG ?= v0.3.7$(BUILD_META)
+TAG ?= v0.5.0$(BUILD_META)
 
 ifneq ($(DRONE_TAG),)
 TAG := $(DRONE_TAG)