build ixhttpd on docker with centos7

docker/Dockerfile.centos7_httpd

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+FROM centos:7 as build
+
+RUN yum install -y gcc-c++ make zlib-devel redhat-rpm-config
+
+RUN groupadd app && useradd -g app app
+RUN chown -R app:app /opt
+RUN chown -R app:app /usr/local
+
+# There is a bug in CMake where we cannot build from the root top folder
+# So we build from /opt
+COPY --chown=app:app . /opt
+WORKDIR /opt
+
+USER app
+RUN [ "make", "httpd_linux" ]
+RUN [ "rm", "-rf", "build" ]
+
+FROM centos:8 as runtime
+
+RUN groupadd app && useradd -g app app
+COPY --chown=app:app --from=build /usr/local/bin/ixhttpd /usr/local/bin/ixhttpd
+RUN chmod +x /usr/local/bin/ixhttpd
+RUN ldd /usr/local/bin/ixhttpd
+
+# Copy source code for gcc
+COPY --chown=app:app --from=build /opt /opt
+
+# Now run in usermode
+USER app
+WORKDIR /home/app
+
+ENTRYPOINT ["ixhttpd"]
+EXPOSE 9999