change PLUS_REPO to pkgs-test.nginx.com to easily deploy R33

Author: AlexFenlon

Makefile

@@ -9,7 +9,7 @@ REGISTRY                      ?= ## The registry where the image is located.
 PREFIX                        ?= nginx/nginx-ingress ## The name of the image. For example, nginx/nginx-ingress
 TAG                           ?= $(VERSION:v%=%) ## The tag of the image. For example, 2.0.0
 TARGET                        ?= local ## The target of the build. Possible values: local, container and download
-PLUS_REPO                     ?= "pkgs.nginx.com" ## The package repo to install nginx-plus from
+PLUS_REPO                     ?= "pkgs-test.nginx.com" ## The package repo to install nginx-plus from
 override DOCKER_BUILD_OPTIONS += --build-arg IC_VERSION=$(VERSION) --build-arg PACKAGE_REPO=$(PLUS_REPO) ## The options for the docker build command. For example, --pull
 ARCH                          ?= amd64 ## The architecture of the image or binary. For example: amd64, arm64, ppc64le, s390x. Not all architectures are supported for all targets
 GOOS                          ?= linux ## The OS of the binary. For example linux, darwin