Added password annotations

Author: iluhinsky

.github/workflows/go.yml

@@ -36,7 +36,7 @@ jobs:
         image: ankane/pgvector:v0.5.1
         env:
           POSTGRES_USER: root
-          POSTGRES_PASSWORD: password
+          POSTGRES_PASSWORD: password # example value of a secret
           POSTGRES_DB: perfkit_pg_vector_db_ci
         ports:
           - 5432:5432
@@ -117,7 +117,7 @@ jobs:
           node.name: os-test
           discovery.type: single-node
           OPENSEARCH_JAVA_OPTS: -Xms512m -Xmx512m
-          OPENSEARCH_INITIAL_ADMIN_PASSWORD: bgnYFGR2RhN3SCX
+          OPENSEARCH_INITIAL_ADMIN_PASSWORD: bgnYFGR2RhN3SCX # example value of a secret compliant with OpenSearch password policy
           plugins.security.ssl.http.enabled: false
         ports:
           - 9201:9200