Merge pull request #1 from sidwood/feature/update-gcloud-version

Update gcloud sdk version to 198.0.0 and add --no-cache flag to `RUN` command

Dockerfile

@@ -1,13 +1,13 @@
 # Version. Can change in build progress
-ARG GCLOUD_SDK_VERSION=183.0.0-alpine
+ARG GCLOUD_SDK_VERSION=198.0.0-alpine
 
 # Use google cloud sdk
 FROM google/cloud-sdk:$GCLOUD_SDK_VERSION
 MAINTAINER Singularities
 
 # Install Java 8 for Datastore emulator
-RUN apk --update add openjdk8-jre
-RUN gcloud components install cloud-datastore-emulator beta --quiet
+RUN apk add --update --no-cache openjdk8-jre &&\
+    gcloud components install cloud-datastore-emulator beta --quiet
 
 # Volume to persist Datastore data
 VOLUME /opt/data
@@ -16,4 +16,4 @@ COPY start-datastore .
 
 EXPOSE 8081
 
-ENTRYPOINT ["./start-datastore"]
+ENTRYPOINT ["./start-datastore"]