chore: add installer-base to the list of signed images

It has to be signed to be used as the base for imager operations.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

Author: smira

Makefile

@@ -695,7 +695,7 @@ clean: ## Cleans up all artifacts.
 
 .PHONY: image-list
 image-list: ## Prints a list of all images built by this Makefile with digests.
-	@echo -n installer talos imager talosctl | xargs -d ' ' -I{} sh -c 'echo $(REGISTRY_AND_USERNAME)/{}:$(IMAGE_TAG)' | xargs -I{} sh -c 'echo {}@$$(crane digest {})'
+	@echo -n installer installer-base talos imager talosctl | xargs -d ' ' -I{} sh -c 'echo $(REGISTRY_AND_USERNAME)/{}:$(IMAGE_TAG)' | xargs -I{} sh -c 'echo {}@$$(crane digest {})'
 
 .PHONY: sign-images
 sign-images: ## Run cosign to sign all images built by this Makefile.