improve stack detection

stack/drone/drone-runner-docker.yml

@@ -17,8 +17,3 @@ services:
     restart: always
     volumes:
     - /var/run/docker.sock:/var/run/docker.sock
-
-networks:
-  private:
-      external: true
-      name: ${DOCKER_NETWORK_PRIVATE}

stack/drone/drone.yml

@@ -33,11 +33,3 @@ services:
 
 volumes:
   drone:
-
-networks:
-  private:
-    external: true
-    name: ${DOCKER_NETWORK_PRIVATE}
-  public:
-    external: true
-    name: ${DOCKER_NETWORK_PUBLIC}

stack/drone/gc.yml

@@ -11,8 +11,3 @@ services:
     restart: always
     volumes:
     - /var/run/docker.sock:/var/run/docker.sock
-
-networks:
-  private:
-      external: true
-      name: ${DOCKER_NETWORK_PRIVATE}