Stop making a new S3 bucket for every integration tests run (#127)

Author: nhinsch

tests/integration/serverless.yml

@@ -12,6 +12,8 @@ provider:
     DD_API_KEY: ${env:DD_API_KEY}
   lambdaHashingVersion: 20201221
   timeout: 15
+  deploymentBucket:
+    name: integration-tests-deployment-bucket
   iam:
     # IAM permissions require that all functions are deployed with this role
     role: "arn:aws:iam::601427279990:role/serverless-integration-test-lambda-role"