Add Dockerfile.

.dockerignore

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+*\#*
+*~
+.DS_Store
+.cabal-sandbox
+cabal.sandbox.config
+dist
+results.xml
+dist-newstyle
+.stack-work
+.ghc.environment.x86_64-darwin-8.2.2
+
+# don't check in generated documentation
+#docs/CryptolPrims.pdf
+#docs/ProgrammingCryptol.pdf
+#docs/Syntax.pdf
+#docs/Version2Changes.pdf
+
+# don't check in distribution files
+cryptol-2.*
+
+# temporary notebook stuff until we split out the repo
+/ICryptol/ICryptol-2.*
+/ICryptol/profile.tar
+/ICryptol/profile_cryptol/security/
+/ICryptol/profile_cryptol/startup/
+/bench*.xml
+
+# vim swap files
+.*.swp
+.*.swo
+
+Dockerfile*
+.git
+.gitignore

Dockerfile

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+FROM alpine:edge AS build
+RUN adduser -D cryptol \
+    && apk add -X http://dl-cdn.alpinelinux.org/alpine/edge/testing z3 \
+    && rm /usr/lib/libz3.so* \
+    && apk add build-base cabal ghc wget ncurses-dev \
+    && su -c 'cabal update' cryptol
+COPY --chown=cryptol:cryptol . /cryptol
+USER cryptol
+WORKDIR /cryptol
+ARG CRYPTOLPATH="/home/cryptol/.cryptol"
+ARG TESTS="modsys parser issues regression renamer mono-binds"
+ARG DIFF="diff"
+ARG IGNORE_EXPECTED="--ignore-expected"
+ARG CABAL_BUILD_FLAGS="-j"
+ARG CABAL_INSTALL_FLAGS="${CABAL_BUILD_FLAGS}"
+RUN make tarball
+RUN make test
+RUN mkdir -p rootfs/"${CRYPTOLPATH}" \
+    && cp -r lib/* rootfs/"${CRYPTOLPATH}" \
+    && mkdir -p rootfs/usr/local \
+    && rm -r cryptol-*-Linux-*_unknown/share/doc \
+    && mv cryptol-*-Linux-*_unknown/* rootfs/usr/local
+USER root
+RUN chown -R root:root /cryptol/rootfs
+
+FROM alpine:edge
+COPY --from=build /cryptol/rootfs /
+RUN adduser -D cryptol \
+    && chown -R cryptol:cryptol /home/cryptol \
+    && apk add -X http://dl-cdn.alpinelinux.org/alpine/edge/testing z3 \
+    && rm /usr/lib/libz3.so* \
+    && apk add gmp libffi musl ncurses-libs \
+    && rm -r /var/cache/apk/*
+USER cryptol
+ENTRYPOINT ["/usr/local/bin/cryptol"]