Fix app SSL error in integration test (#54)

Author: wangzlei

.github/collector/docker-compose.yml

@@ -21,7 +21,7 @@ services:
       - AWS_SECRET_ACCESS_KEY
       - AWS_SESSION_TOKEN
       - OTEL_RESOURCE_ATTRIBUTES=service.name=aws-otel-integ-test
-      - OTEL_EXPORTER_OTLP_ENDPOINT=grpc://otel:4317
+      - OTEL_EXPORTER_OTLP_ENDPOINT=http://otel:4317
       - AWS_REGION=us-west-2
     ports:
       - '8080:8080'