fix: ensure image can be built on m1 macos

When running any of the image build  make targets on an m1 macos, it fails due to
the following error: qemu-x87_64: Could not open '/lib64/ld-linux-x86-64.so.2

Specify platform to ensure build uses the correct architecture.

Makefile

@@ -70,6 +70,14 @@ CURL ?= curl
 OC ?= oc
 OCM ?= ocm
 
+# Set os specific variables
+ifeq ($(shell uname -s | tr A-Z a-z), darwin)
+	PGHOST:="127.0.0.1"
+	CONTAINER_IMAGE_BUILD_PLATFORM ?= --platform linux/amd64
+else
+	PGHOST:="172.18.0.22"
+endif
+
 GOLANGCI_LINT ?= $(LOCAL_BIN_PATH)/golangci-lint
 golangci-lint:
 ifeq (, $(shell which $(LOCAL_BIN_PATH)/golangci-lint 2> /dev/null))
@@ -159,14 +167,6 @@ openapi/spec/validate: specinstall
 	${SPECTRAL} lint ../../openapi/kas-fleet-manager.yaml ../../openapi/kas-fleet-manager-private-admin.yaml ;\
 	}
 
-
-
-ifeq ($(shell uname -s | tr A-Z a-z), darwin)
-        PGHOST:="127.0.0.1"
-else
-        PGHOST:="172.18.0.22"
-endif
-
 ### Environment-sourced variables with defaults
 # Can be overriden by setting environment var before running
 # Example:
@@ -603,7 +603,7 @@ docker/login/internal:
 
 # Build the binary and image
 image/build:
-	$(DOCKER) --config="${DOCKER_CONFIG}" build --pull -t "$(external_image_registry)/$(image_repository):$(image_tag)" .
+	$(DOCKER) --config="${DOCKER_CONFIG}" build $(CONTAINER_IMAGE_BUILD_PLATFORM) --pull -t "$(external_image_registry)/$(image_repository):$(image_tag)" .
 .PHONY: image/build
 
 # Build and push the image
@@ -614,7 +614,7 @@ image/push: image/build
 # build binary and image for OpenShift deployment
 image/build/internal: IMAGE_TAG ?= $(image_tag)
 image/build/internal:
-	$(DOCKER) build -t "$(shell $(OC) get route default-route -n openshift-image-registry -o jsonpath="{.spec.host}")/$(image_repository):$(IMAGE_TAG)" .
+	$(DOCKER) build $(CONTAINER_IMAGE_BUILD_PLATFORM) -t "$(shell $(OC) get route default-route -n openshift-image-registry -o jsonpath="{.spec.host}")/$(image_repository):$(IMAGE_TAG)" .
 .PHONY: image/build/internal
 
 # push the image to the OpenShift internal registry