Added bundle PR tag

Author: Juansasa

Makefile

@@ -320,7 +320,7 @@ endif
 
 # A comma-separated list of bundle images (e.g. make catalog-build BUNDLE_IMGS=example.com/operator-bundle:v0.1.0,example.com/operator-bundle:v0.2.0).
 # These images MUST exist in a registry and be pull-able.
-BUNDLE_IMGS ?= $(BUNDLE_IMG)
+BUNDLE_IMG ?= $(IMAGE_TAG_BASE)-bundle:v$(VERSION)$(PR_TAG)
 
 # The image tag given to the resulting catalog image (e.g. make catalog-build CATALOG_IMG=example.com/operator-catalog:v0.2.0).
 CATALOG_IMG ?= $(IMAGE_TAG_BASE)-catalog:v$(VERSION)$(PR_TAG)