Restore build as the default make rule (#2935)

Makefile

@@ -55,11 +55,11 @@ else
 	endif
 endif
 
-include docker/Makefile
-
 .PHONY: all
 all: build
 
+include docker/Makefile
+
 .PHONY: clean
 clean:
 	$(GO) clean -i ./...