Prevent pulling builder when building from source (#1937)

This is a workaround to a podman issue in which, adding --platform to a
pull command, will cause podman to always pull the image. This is
particularly annoying when testing changes to the builder image, since
setting it to run will overwrite the local image and pull an existing
one instead.

Makefile

@@ -28,6 +28,9 @@ ifneq ($(BUILD_BUILDER_IMAGE), false)
 		-t quay.io/stackrox-io/collector-builder:$(COLLECTOR_BUILDER_TAG) \
 		-f "$(CURDIR)/builder/Dockerfile" \
 		"$(CURDIR)/builder"
+else
+	docker pull --platform ${PLATFORM} \
+		quay.io/stackrox-io/collector-builder:$(COLLECTOR_BUILDER_TAG)
 endif
 
 collector: check-builder
@@ -82,7 +85,7 @@ endif
 start-builder: builder teardown-builder
 	docker run -d \
 		--name $(COLLECTOR_BUILDER_NAME) \
-		--pull missing \
+		--pull never \
 		--platform ${PLATFORM} \
 		-v $(CURDIR):$(CURDIR) \
 		$(if $(LOCAL_SSH_PORT),-p $(LOCAL_SSH_PORT):22 )\