minor fix

docker-compose.yml

@@ -41,8 +41,7 @@ services:
       - "8081:8080"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
-      - type: tmpfs
-        target: /tmp/dta-tests
+      - '/tmp/dta-tests:/tmp/dta-tests'
     restart: unless-stopped
     # This service can be reached by the 'web' container at http://backend:[port]