build, Dockerfile: bump Go to 1.18

build/ci.go

@@ -148,7 +148,7 @@ var (
 	// This is the version of go that will be downloaded by
 	//
 	//     go run ci.go install -dlgo
-	dlgoVersion = "1.17.5"
+	dlgoVersion = "1.18"
 )
 
 var GOBIN, _ = filepath.Abs(filepath.Join("build", "bin"))
@@ -338,10 +338,10 @@ func downloadLinter(cachedir string) string {
 	arch := runtime.GOARCH
 	ext := ".tar.gz"
 
-        if runtime.GOOS == "windows" {
-	        ext = ".zip"
-        }
-        if arch == "arm" {
+	if runtime.GOOS == "windows" {
+		ext = ".zip"
+	}
+	if arch == "arm" {
 		arch += "v" + os.Getenv("GOARM")
 	}
 	base := fmt.Sprintf("golangci-lint-%s-%s-%s", version, runtime.GOOS, arch)