chore: preparing release 0.4.1

Signed-off-by: Kostis (Codefresh) <39800303+kostis-codefresh@users.noreply.github.com>

Author: kostis-codefresh

RELEASE_NOTES.md

@@ -1,6 +1,4 @@
-This is the first release of the plugin that has GRPC support
+This is the first release of the plugin that is also packaged as a docker container.
+Therefore the binary is available as a release artifact but also as a container image stored
+in GitHub packages. Two container images (arm64/amd64) are currently available.
 
-Also
-
-- Added E2E integration tests
-- Fixed multi-arch images