Add opensearch build repo logo image (#3515)

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

Author: peterzhuamazon

README.md

@@ -1,4 +1,4 @@
-<img src="https://opensearch.org/assets/brand/SVG/Logo/opensearch_logo_default.svg" height="64px"/>
+<img src="https://raw.githubusercontent.com/opensearch-project/opensearch-build/main/opensearch_build_image.png" height="64px" alt="OpenSearch Build">
 
 [![python](https://github.com/opensearch-project/opensearch-build/actions/workflows/python-tests.yml/badge.svg)](https://github.com/opensearch-project/opensearch-build/actions/workflows/python-tests.yml)
 [![groovy](https://github.com/opensearch-project/opensearch-build/actions/workflows/groovy-tests.yml/badge.svg)](https://github.com/opensearch-project/opensearch-build/actions/workflows/groovy-tests.yml)