Add armv7 image

armv7-linux-deb9/Dockerfile

+FROM arm32v7/debian:stretch
+
+ENV LANG C.UTF-8
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Core build utilities
+RUN apt-get update \
+    && apt-get install --no-install-recommends -qy zlib1g-dev libtinfo-dev libgmp10 libsqlite3-0 libsqlite3-dev \
+    ca-certificates g++ git make automake autoconf gcc \
+    perl python3 texinfo xz-utils lbzip2 bzip2 patch openssh-client sudo time \
+    jq wget curl \
+    # Documentation tools
+    python3-sphinx texlive-xetex texlive-latex-extra \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Boot LLVM
+ENV PATH /usr/local/bin:$PATH
+ENV LLVM_TARBALL http://releases.llvm.org/5.0.1/clang+llvm-5.0.1-armv7a-linux-gnueabihf.tar.xz
+RUN curl $LLVM_TARBALL | tar -xJC .. && \
+    mkdir /opt/llvm5 && \
+    cp -R clang+llvm*/* /opt/llvm5 && \
+    rm -R clang+llvm* && \
+    /opt/llvm5/bin/llc --version
+
+# GHC
+RUN curl http://home.smart-cactus.org/~ben/ghc/ghc-8.4.4-arm-unknown-linux.tar.xz | tar -xJ
+#RUN curl http://downloads.haskell.org/~ghc/8.6.2/ghc-8.6.2-aarch64-ubuntu_bionic-linux.tar.xz | tar -xJ
+WORKDIR /ghc-8.4.4
+RUN ./configure --prefix=/usr/local LLC=/opt/llvm5/bin/llc OPT=/opt/llvm5/bin/opt && \
+    make install
+WORKDIR /
+RUN rm -Rf ghc-*
+RUN ghc --version
+
+# XXX: Terrible terrible hack
+RUN ln -s libgmp.so.10 /usr/lib/arm-linux-gnueabihf/libgmp.so
+
+# LLVM
+ENV LLVM_TARBALL http://releases.llvm.org/7.0.0/clang+llvm-7.0.0-armv7a-linux-gnueabihf.tar.xz
+ENV LLC /opt/llvm7/bin/llc
+ENV OPT /opt/llvm7/bin/opt
+RUN curl $LLVM_TARBALL | tar -xJC .. && \
+    mkdir /opt/llvm7 && \
+    cp -R clang+llvm*/* /opt/llvm7 && \
+    rm -R clang+llvm* && \
+    $LLC --version
+
+# Cabal
+RUN git clone https://github.com/haskell/Cabal
+WORKDIR /Cabal
+RUN git checkout cabal-install-v2.4.1.0
+WORKDIR /Cabal/cabal-install
+RUN ./bootstrap.sh --global --no-doc
+
+RUN ls /Cabal/cabal-install/dist/build
+
+ENV PATH /home/ghc/.local/bin:/opt/cabal/2.2/bin:/opt/ghc/8.4.2/bin:$PATH
+
+# Create a normal user.
+RUN adduser ghc --gecos "GHC builds" --disabled-password
+RUN echo "ghc ALL = NOPASSWD : ALL" > /etc/sudoers.d/ghc
+USER ghc
+WORKDIR /home/ghc/
+
+# Build Haskell tools
+RUN cabal update && \
+    cabal install hscolour happy alex --constraint 'happy ^>= 1.19.10'
+ENV PATH /home/ghc/.cabal/bin:$PATH
+
+CMD ["bash"]
+