Update go to 1.15 (#24)

* Update go to 1.15
* Update go dependencies

.cicd/build.sh

@@ -4,15 +4,15 @@ set -eox pipefail
 . .cicd/env.sh
 
 build() {
-  ldflags="-X $mod/core.Version=$vers -X $mod/core.BuildTime=$buildTime"
+  ldflags="-X $mod/core.Version=$vers -X $mod/core.BuildTime=$buildTime -buildid= -w -s"
   docker run --rm \
     -v "$(pwd):/go/src/$mod" \
     -w "/go/src/$mod"  \
     -e CGO_ENABLED=0   \
     -e GOOS=linux      \
     -e GOARCH=$1       \
-    golang:1.14-stretch \
-      go build -mod=vendor -o kube-webhook-certgen-$1 -ldflags "$ldflags"
+    golang:1.15-buster \
+      go build -mod=vendor -o kube-webhook-certgen-$1 -trimpath -ldflags="$ldflags"
 }
 
 build amd64

.cicd/checks.sh

@@ -11,5 +11,5 @@ docker run --rm \
   -e CGO_ENABLED=0   \
   -e GOOS=linux      \
   -e GOARCH=amd64    \
-  golang:1.14-stretch \
+  golang:1.15-buster \
     /bin/bash -c "$command"

.cicd/test.sh

@@ -20,5 +20,5 @@ docker run --rm \
   -e CGO_ENABLED=0   \
   -e GOOS=linux      \
   -e GOARCH=amd64    \
-  golang:1.14-stretch \
+  golang:1.15-buster \
     /bin/bash -c "$command"

go.mod

@@ -1,14 +1,13 @@
 module github.com/jet/kube-webhook-certgen
 
-go 1.14
+go 1.15
 
 require (
-	github.com/googleapis/gnostic v0.2.0 // indirect
 	github.com/imdario/mergo v0.3.7 // indirect
 	github.com/onrik/logrus v0.3.0
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/cobra v0.0.4
-	k8s.io/api v0.18.5
-	k8s.io/apimachinery v0.18.5
-	k8s.io/client-go v0.18.5
+	k8s.io/api v0.19.2
+	k8s.io/apimachinery v0.19.2
+	k8s.io/client-go v0.19.2
 )