fix(runtime): keep default build threads below smoke threshold

compose.yaml

@@ -50,7 +50,7 @@ services:
       CORE_SSH_PRIVATE_KEY_BASE64: ${CORE_SSH_PRIVATE_KEY_BASE64:-}
       CORE_SSH_KNOWN_HOSTS_BASE64: ${CORE_SSH_KNOWN_HOSTS_BASE64:-}
       NODE_OPTIONS: ${RUNTIME_NODE_OPTIONS:---max-old-space-size=1536}
-      RAYON_NUM_THREADS: ${RUNTIME_RAYON_NUM_THREADS:-2}
+      RAYON_NUM_THREADS: ${RUNTIME_RAYON_NUM_THREADS:-1}
       POSTGRES_HOST: postgres
       POSTGRES_PORT: '5432'
       POSTGRES_DB: ${POSTGRES_DB:-sammo}