UPSTREAM: <carry>: Add manifests to .PHONY in Makefile

Without this, make sees the manifests directory we added and thinks
the target is always up to date.

(cherry picked from commit c0fd1a9)
(cherry picked from commit c7d95f8)
(cherry picked from commit e3bc585)
(cherry picked from commit 2e373ba)
(cherry picked from commit eeff5e4)
(cherry picked from commit cfabf98)
(cherry picked from commit fd969a0)
(cherry picked from commit 8710bef)
(cherry picked from commit 2358110)
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>

Makefile

@@ -265,4 +265,5 @@ olm-push: bundle-push index-push
 	generate-manifests \
 	tools \
 	bundle \
-	bundle-build
+	bundle-build \
+	manifests