message: Reduce random data payload for CD stability
  CI can't handle generating 1KB from /dev/urandom. Github runner freezes and the jobs never complete.
  Allowing size configuration via env var, but defaulting to 100 bytes.
diff: @@ -6,7 +6,7 @@ readonly CLI_VERSION=${1-stable}
  readonly CLUSTER_VERSION=${2-latest}
  readonly TEST_TOPIC=$CLI_VERSION-x-$CLUSTER_VERSION
  readonly FLUVIO_BIN=~/.fluvio/bin/fluvio
  -readonly PAYLOAD_SIZE=1000
  +readonly PAYLOAD_SIZE=${PAYLOAD_SIZE:-100}
  function setup_cluster() {
  echo "Installing cluster @ VERSION: $CLUSTER_VERSION"
  