improve baked variables

Author: Erisa

docker-bake.hcl

@@ -10,12 +10,20 @@ variable "MULTI_PLATFORM" {
     default = false
 }
 
+variable "GOVERSION" {
+    default = "1.23.9"
+}
+
+variable "ALPINEVERSION" {
+    default = "3.21"
+}
+
 target "default" {
     target = "build"
     args = {
-        VERSION = "${CLOUDFLARED_VERSION}"
-        GOVERSION = "1.23.9"
-        ALPINEVERSION = "3.21"
+        VERSION = CLOUDFLARED_VERSION
+        GOVERSION = GOVERSION
+        ALPINEVERSION = ALPINEVERSION
     }
     platforms = !MULTI_PLATFORM ? null : [
         "linux/amd64",