build number cache buster

src/util/build-number.go

@@ -1,20 +1,9 @@
 package util
 
 import (
-	"fmt"
 	"os"
 )
 
-var buildNumber string
-
 func GetBuildNumber() string {
-	if buildNumber == "" {
-		b, err := os.ReadFile("build_number") // just pass the file name
-		if err != nil {
-			fmt.Print(err)
-		}
-		buildNumber = string(b)
-	}
-
-	return buildNumber
+	return os.Getenv("BUILD_NUMBER")
 }