fix: Fixes sensor service test that was flaky and moves docker stuff into it's own directory.

docker/docker-compose-test.yaml

@@ -0,0 +1,22 @@
+# run this with docker-compose run test
+services:
+  test:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.test
+    working_dir: /app
+    depends_on:
+      - mosquitto
+    environment:
+      - MOSQUITTO_SERVER=mosquitto
+    command: /bin/bash -xc "swift test"
+
+  mosquitto:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.mosquitto
+
+networks:
+  test:
+    driver: bridge
+    external: false