Display the checksums in CI

When Helm is packaging up the bundles it generates the checksums
but does not display them. Having them here will aide in the
generation of release notes and provide another source
listing them.
Signed-off-by: Matt Farina <matt@mattfarina.com>

Makefile

@@ -48,6 +48,7 @@ dist:
 checksum:
 	for f in _dist/*.{gz,zip} ; do \
 		shasum -a 256 "$${f}"  | awk '{print $$1}' > "$${f}.sha256" ; \
+		echo -n "Checksum: " && cat $${f}.sha256 ; \
 	done
 
 .PHONY: check-docker