make deploy should use provided COMMIT as tag or use the most recent tag

COMMIT is provided in the confif file for any environment that is not
development. For these, the behavior do not change

If COMMIT is not provided, we query azure ACR for the most recent tag
and use that.

backend/Makefile

@@ -1,10 +1,12 @@
 -include ../setup-env.mk
 
-ifndef COMMIT
-COMMIT := $(shell git rev-parse --short=7 HEAD)
+ARO_HCP_REGISTRY ?= ${ARO_HCP_IMAGE_ACR}.azurecr.io
+ARO_HCP_REPOSITORY := arohcpbackend
+
+ifeq ($(strip $(COMMIT)),)
+COMMIT := $(shell az acr repository show-tags --name ${ARO_HCP_IMAGE_ACR} --repository ${ARO_HCP_REPOSITORY} --orderby time_desc --top 1 --output tsv)
 endif
-ARO_HCP_BASE_IMAGE ?= ${ARO_HCP_IMAGE_ACR}.azurecr.io
-ARO_HCP_BACKEND_IMAGE ?= $(ARO_HCP_BASE_IMAGE)/arohcpbackend:$(COMMIT)
+ARO_HCP_BACKEND_IMAGE ?= $(ARO_HCP_REGISTRY)/$(ARO_HCP_REPOSITORY):$(COMMIT)
 
 .DEFAULT_GOAL := backend
 

frontend/Makefile

@@ -1,10 +1,12 @@
 -include ../setup-env.mk
 
-ifndef COMMIT
-COMMIT := $(shell git rev-parse --short=7 HEAD)
+ARO_HCP_REGISTRY ?= ${ARO_HCP_IMAGE_ACR}.azurecr.io
+ARO_HCP_REPOSITORY := arohcpfrontend
+
+ifeq ($(strip $(COMMIT)),)
+COMMIT := $(shell az acr repository show-tags --name ${ARO_HCP_IMAGE_ACR} --repository ${ARO_HCP_REPOSITORY} --orderby time_desc --top 1 --output tsv)
 endif
-ARO_HCP_BASE_IMAGE ?= ${ARO_HCP_IMAGE_ACR}.azurecr.io
-ARO_HCP_FRONTEND_IMAGE ?= $(ARO_HCP_BASE_IMAGE)/arohcpfrontend:$(COMMIT)
+ARO_HCP_FRONTEND_IMAGE ?= $(ARO_HCP_REGISTRY)/$(ARO_HCP_REPOSITORY):$(COMMIT)
 
 .DEFAULT_GOAL := frontend