Minor fixes for next release (originally fixing yarn warning)

Dockerfile

@@ -32,15 +32,21 @@ RUN echo "deb http://ftp.debian.org/debian stretch-backports main" >> /etc/apt/s
     touch /etc/inittab && \
     echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 
+ARG gateway_url
+ENV gateway_url ${url:-https://github.com/mozilla-iot/gateway}
+ARG gateway_branch
+ENV gateway_branch ${branch:-master}
+
 USER node
-RUN cd /home/node && \
+WORKDIR /home/node
+RUN set -x && \
     npm install yarn && \
     mkdir mozilla-iot && \
     cd mozilla-iot && \
-    git clone https://github.com/mozilla-iot/intent-parser && \
-    git clone https://github.com/mozilla-iot/gateway && \
+    git clone --depth 1 --recursive https://github.com/mozilla-iot/intent-parser && \
+    git clone --depth 1 --recursive -b ${gateway_branch} ${gateway_url} && \
     cd gateway && \
-    /home/node/node_modules/.bin/yarn
+    /home/node/node_modules/.bin/yarn --verbose
 
 USER root
 ADD service /etc/service

docker-compose.yml

@@ -0,0 +1,11 @@
+version: "2"
+
+services:
+  web:
+    build: .
+    command: /home/node/mozilla-iot/gateway/run-app.sh
+    volumes:
+      - /home/node/.mozilla-iot
+    ports:
+      - "8080:8080"
+      - "4443:4443"