Add docker build

Dockerfile

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+FROM alpine:edge
+
+# ghc and cabal
+RUN apk add --no-cache \
+	curl \
+	gcc \
+	g++ \
+	gmp-dev \
+	ncurses-dev \
+	libffi-dev \
+	make \
+	xz \
+	tar \
+	perl \
+	\
+	cabal \
+	ghc
+
+# utils
+RUN apk add --no-cache \
+	bash
+
+## Package specific
+RUN apk add --no-cache \
+	libbz2 \
+	bzip2-dev \
+	bzip2-static \
+	zlib \
+	zlib-dev \
+	zlib-static \
+	gmp \
+	gmp-dev \
+	openssl-dev \
+	openssl-libs-static \
+	xz \
+	xz-dev
+
+
+
+COPY . /app
+
+WORKDIR /app
+
+RUN chmod +x /app/docker/build.sh
+

docker/build.sh

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+#!/bin/sh
+
+set -ex
+
+cd /app
+
+cabal v2-update
+
+cabal v2-install \
+	--install-method=copy \
+	--overwrite-policy=always \
+	--installdir="/bin" \
+	--ghc-options='-optl-static'
+