Dockerfile in fir-cli-1.6.4 vs Dockerfile in fir-cli-1.6.6.beta1

@@ -1,12 +1,8 @@
 FROM ruby:2.4.2
 
 ENV WORKDIR=/fir-cli
 ENV HOME=/fir-cli
-
 RUN gem install fir-cli
-
 RUN mkdir -p $WORKDIR
-
 WORKDIR $WORKDIR
-
-CMD ["fir"]
+ENTRYPOINT ["fir"]
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