add rules_docker
diff --git a/buildkite/bazelci.py b/buildkite/bazelci.py
index b7c993d..7641f63 100644
--- a/buildkite/bazelci.py
+++ b/buildkite/bazelci.py
@@ -137,6 +137,10 @@
             "git_repository": "https://github.com/bazelbuild/rules_d.git",
             "http_config": "https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/pipelines/rules_d-postsubmit.json"
         },
+        "rules_docker": {
+            "git_repository": "https://github.com/bazelbuild/rules_docker.git",
+            "http_config": "https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/pipelines/rules_docker-postsubmit.json"
+        },
         "rules_go": {
             "git_repository": "https://github.com/bazelbuild/rules_go.git",
             "http_config": "https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/pipelines/rules_go-postsubmit.json"
diff --git a/buildkite/pipelines/rules_docker-postsubmit.json b/buildkite/pipelines/rules_docker-postsubmit.json
new file mode 100644
index 0000000..5cc8092
--- /dev/null
+++ b/buildkite/pipelines/rules_docker-postsubmit.json
@@ -0,0 +1,8 @@
+{
+  "platforms": {
+    "ubuntu1404": {"build_targets": ["..."], "test_targets": ["..."]},
+    "ubuntu1604": {"build_targets": ["..."], "test_targets": ["..."]},
+    "macos": {"build_targets": ["..."]}
+  }
+}
+