adding langchain to test suite

test/run-upstream

@@ -26,6 +26,7 @@ test_client_faas
 test_client_cloudevents
 test_client_fastify
 test_client_pino
+test_client_langchain
 "
 
 readonly EXPRESS_REVISION="${EXPRESS_REVISION:-$(docker run --rm "${IMAGE_NAME}" -- npm show express version)}"
@@ -44,6 +45,8 @@ readonly CLOUDEVENTS_REVISION="v${CLOUDEVENTS_REVISION:-$(docker run --rm "${IMA
 readonly CLOUDEVENTS_REPO="https://github.com/cloudevents/sdk-javascript.git"
 readonly FASTIFY_REVISION="v${FASTIFY_REVISION:-$(docker run --rm "${IMAGE_NAME}" -- npm show fastify version)}"
 readonly FASTIFY_REPO="https://github.com/fastify/fastify.git"
+readonly LANGCHAIN_REVISION=v"${LANGCHAIN_REVISION:-$(docker run --rm "${IMAGE_NAME}" -- npm show langchain version)}"
+readonly LANGCHAIN_REPO="https://github.com/langchain-ai/langchainjs"
 
 # Since we built the candidate image locally, we don't want S2I attempt to pull
 # it from a registry