Dockerfile: update to go 1.18

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.4
 
-ARG GO_VERSION=1.17
+ARG GO_VERSION=1.18
 ARG DOCKERD_VERSION=20.10.14
 
 FROM docker:$DOCKERD_VERSION AS dockerd-release

docker-bake.hcl

@@ -1,5 +1,5 @@
 variable "GO_VERSION" {
-  default = "1.17"
+  default = "1.18"
 }
 variable "BIN_OUT" {
   default = "./bin"

hack/dockerfiles/docs.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.4
 
-ARG GO_VERSION=1.17
+ARG GO_VERSION=1.18
 ARG FORMATS=md,yaml
 
 FROM golang:${GO_VERSION}-alpine AS docsgen

hack/dockerfiles/lint.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.4
 
-ARG GO_VERSION=1.17
+ARG GO_VERSION=1.18
 
 FROM golang:${GO_VERSION}-alpine
 RUN apk add --no-cache gcc musl-dev yamllint

hack/dockerfiles/vendor.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.4
 
-ARG GO_VERSION=1.17
+ARG GO_VERSION=1.18
 ARG MODOUTDATED_VERSION=v0.8.0
 
 FROM golang:${GO_VERSION}-alpine AS base