add integration tests from GH issues

integration/dockerfiles/Dockerfile_test_issue_506

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+FROM ubuntu:18.04
+RUN mkdir -p /var/run/test-foobar

integration/dockerfiles/Dockerfile_test_issue_519

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+FROM alpine as base_stage
+RUN echo base_stage
+RUN touch meow.txt
+
+FROM base_stage as BUG_stage
+RUN echo BUG_stage
+RUN touch purr.txt
+
+
+FROM BUG_stage as final_stage
+RUN echo final_stage
+RUN touch mew.txt

integration/dockerfiles/Dockerfile_test_issue_647

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+FROM alpine:3.8 AS foo
+RUN mkdir /foo
+WORKDIR /foo
+RUN mkdir some_dir
+RUN touch some_file
+RUN chmod 777 some_dir
+RUN chmod 666 some_file
+RUN ls -l
+
+FROM alpine:3.8
+COPY --from=foo /foo /bar
+RUN ls -l /bar

integration/dockerfiles/Dockerfile_test_issue_684

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+FROM ubuntu:rolling as builder
+
+RUN apt-get update && apt-get -y upgrade && apt-get -y install lib32stdc++6 wget

integration/dockerfiles/Dockerfile_test_issue_704

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+FROM alpine
+
+RUN mkdir -p /some/dir/ && echo 'first' > /some/dir/first.txt
+
+RUN rm /some/dir/first.txt

integration/dockerfiles/Dockerfile_test_issue_713

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+FROM ubuntu:16.04
+ARG TEST=undefined
+RUN echo $TEST > log.txt
+ENTRYPOINT ["echo"]

integration/dockerfiles/Dockerfile_test_issue_713_b

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+FROM botpress/server:v12_0_0
+RUN chmod -R gou+rw /botpress
+WORKDIR /botpress
+
+RUN apt-get update \
+&& apt-get -y install curl gnupg \
+&& curl -sL https://deb.nodesource.com/setup_11.x | bash \
+&& apt-get -y install nodejs \
+&& apt-get -y install rsync \
+&& apt-get upgrade -y
+
+#RUN cd /botpress && npm install && npm install node-sp-auth --save-dev && npm install sp-request --save-dev && npm install activedirectory --save-dev
+
+#EXPOSE 3000-55000
+#CMD ["./bp"]