Update Dockerfile

Dockerfile

@@ -2,14 +2,14 @@ ARG RUBY_VERSION="2.5"
 FROM ruby:${RUBY_VERSION} as ruby
 ARG RUBY_VERSION
 ENV RUBY_VERSION="${RUBY_VERSION}"
-ARG PUPPET_VERSION
-ENV PUPPET_VERSION="${PUPPET_VERSION}"
 RUN rm -rf $GEM_HOME $BUNDLE_PATH $BUNDLE_BIN $BUNDLE_APP_CONFIG
 RUN apt-get update && apt-get install -y cmake openssl libssl-dev
 RUN sed -i'' -e 's/CipherString = DEFAULT@SECLEVEL=2/CipherString = DEFAULT@SECLEVEL=1/g' /etc/ssl/openssl.cnf
 RUN sed -i'' -e 's/MinProtocol = TLSv1.2/MinProtocol = TLSv1/g' /etc/ssl/openssl.cnf
 
 FROM scratch AS app
+ARG PUPPET_VERSION
+ENV PUPPET_VERSION="${PUPPET_VERSION}"
 COPY --from=ruby / /
 WORKDIR /app
 ENV LANG="C.UTF-8"