add example docker file for testing on manylinux-x64

docker/manylinux-x64/Dockerfile

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+FROM quay.io/pypa/manylinux2014_x86_64
+
+# Install tools
+RUN yum install -y openssl-devel
+RUN yum install -y gcc gcc-c++ kernel-devel make
+RUN yum install -y git cmake
+RUN yum install -y vim
+
+RUN mkdir -p  /home/dev
+WORKDIR /home/dev
+
+# Get mimalloc
+RUN git clone https://github.com/microsoft/mimalloc -b dev-slice
+RUN mkdir -p mimalloc/out/release
+RUN mkdir -p mimalloc/out/debug
+
+# Build mimalloc debug
+WORKDIR /home/dev/mimalloc/out/debug
+RUN cmake ../.. -DMI_DEBUG_FULL=ON
+RUN make -j
+
+CMD ["/bin/sh"]

docker/readme.md

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+Various example docker files used for testing.
+
+Usage:
+
+```
+> cd <host>
+> docker build -t <host>-mimalloc .
+> docker run -it <host>-mimalloc
+>> make test
+```