Constant production analytics write key (#252)

* Static production analytics write key

* Make it constant

* Needs type

* Drop init

Author: kke

Makefile

@@ -6,7 +6,7 @@ ifdef TAG_NAME
 endif
 ENVIRONMENT ?= "development"
 
-LD_FLAGS = -s -w -X github.com/k0sproject/k0sctl/version.Environment=$(ENVIRONMENT) -X github.com/k0sproject/k0sctl/integration/segment.WriteKey=$(SEGMENT_WRITE_KEY) -X github.com/k0sproject/k0sctl/version.GitCommit=$(GIT_COMMIT) -X github.com/k0sproject/k0sctl/version.Version=$(K0SCTL_VERSION)
+LD_FLAGS = -s -w -X github.com/k0sproject/k0sctl/version.Environment=$(ENVIRONMENT) -X github.com/k0sproject/k0sctl/version.GitCommit=$(GIT_COMMIT) -X github.com/k0sproject/k0sctl/version.Version=$(K0SCTL_VERSION)
 BUILD_FLAGS = -trimpath -a -tags "netgo static_build" -installsuffix netgo -ldflags "$(LD_FLAGS) -extldflags '-static'"
 
 bin/k0sctl-linux-x64: $(GO_SRCS)

integration/segment/segment.go

@@ -1,7 +1,6 @@
 package segment
 
 import (
-	"os"
 	"runtime"
 
 	"github.com/k0sproject/k0sctl/analytics"
@@ -11,7 +10,7 @@ import (
 )
 
 // WriteKey for analytics
-var WriteKey = "9uTKgGzXDVsC97cioQWpiV40GwSlXFEl"
+const WriteKey string = "oU2iC4shRUBfEboaO0FDuDIUk49Ime92"
 
 // Verbose controls the verbosity of segment analytics client
 var Verbose bool
@@ -66,9 +65,3 @@ func (c Client) Publish(event string, props map[string]interface{}) error {
 func (c Client) Close() {
 	c.client.Close()
 }
-
-func init() {
-	if WriteKey == "" {
-		WriteKey = os.Getenv("SEGMENT_WRITE_KEY")
-	}
-}