Do not attach service to ingress network

This fixes the following API error:

    400 Client Error
    Service cannot be explicitly attached to the ingress network "ingress"

Forwarding the entire networks list from the master container to
`client.services.create` results in `docker.errors.APIError`, when the
list of networks includes the `ingress` network.

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## 0.1.3 - 2019-04-03
+### Fixed
+- Fix Docker API error due to explicitly attaching service to ingress network.
+
 ## 0.1.2 - 2019-03-31
 ### Fixed
 - CI: Do not reject jobs for tagged commits.

src/buildbot_docker_swarm_worker/_plugin.py

@@ -42,7 +42,11 @@ def get_current_container():
         def get_container_networks():
             container = get_current_container()
             if container:
-                return list(container.attrs["NetworkSettings"]["Networks"])
+                return [
+                    network
+                    for network in container.attrs["NetworkSettings"]["Networks"]
+                    if network != "ingress"
+                ]
 
         def aslist(env):
             return list("=".join(item) for item in env.items())