Dockerfile: Add initial Dockerfile

Dockerfile

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+FROM alpine:3.6
+
+LABEL name slither
+LABEL src "https://github.com/trailofbits/slither"
+LABEL creator trailofbits
+LABEL dockerfile_maintenance trailofbits
+LABEL desc "Static Analyzer for Solidity"
+
+# Mostly stolen from ethereum/solc.
+RUN apk add --no-cache git python3 build-base cmake boost-dev \
+&& sed -i -E -e 's/include <sys\/poll.h>/include <poll.h>/' /usr/include/boost/asio/detail/socket_types.hpp \
+&& git clone --depth 1 --recursive -b release https://github.com/ethereum/solidity \
+&& cd /solidity && cmake -DCMAKE_BUILD_TYPE=Release -DTESTS=0 -DSTATIC_LINKING=1 \
+&& cd /solidity && make solc && install -s  solc/solc /usr/bin \
+&& cd / && rm -rf solidity \
+&& rm -rf /var/cache/apk/* \
+&& git clone https://github.com/trailofbits/slither.git
+WORKDIR slither
+RUN python3 setup.py install
+ENTRYPOINT ["slither"]
+CMD ["tests/uninitialized.sol"]