Add docker support

docker/alpine/8.10.7/Dockerfile

+FROM alpine:3.14.2
+
+# install deps needed by GHC
+RUN apk add --no-cache \
+	curl \
+	gcc \
+	g++ \
+	binutils \
+	binutils-gold \
+	gmp \
+	ncurses \
+	libffi \
+	make \
+	xz \
+	tar \
+	perl
+
+ARG GHCUP_VERSION
+
+# install ghcup
+RUN if [ -n "$GHCUP_VERSION" ] ; \
+	then curl -sSfL https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/x86_64-linux-ghcup-$GHCUP_VERSION > /usr/bin/ghcup ; \
+	else curl -sSfL https://downloads.haskell.org/~ghcup/x86_64-linux-ghcup > /usr/bin/ghcup ; \
+	fi && \
+    chmod +x /usr/bin/ghcup
+
+ENV GHCUP_INSTALL_BASE_PREFIX=/usr/local
+ENV PATH=/usr/local/.ghcup/bin:$PATH
+
+RUN ghcup install ghc --set 8.10.7 && \
+    ghcup install cabal latest && \
+    ghcup install stack latest

docker/alpine/minimal/Dockerfile

+FROM alpine:3.14.2
+
+# install deps needed by GHC
+RUN apk add --no-cache \
+	curl \
+	gcc \
+	g++ \
+	binutils \
+	binutils-gold \
+	gmp \
+	ncurses \
+	libffi \
+	make \
+	xz \
+	tar \
+	perl
+
+ARG GHCUP_VERSION
+
+# install ghcup
+RUN if [ -n "$GHCUP_VERSION" ] ; \
+	then curl -sSfL https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/x86_64-linux-ghcup-$GHCUP_VERSION > /usr/bin/ghcup ; \
+	else curl -sSfL https://downloads.haskell.org/~ghcup/x86_64-linux-ghcup > /usr/bin/ghcup ; \
+	fi && \
+    chmod +x /usr/bin/ghcup
+
+ENV GHCUP_INSTALL_BASE_PREFIX=/usr/local
+ENV PATH=/usr/local/.ghcup/bin:$PATH
+
+RUN ghcup prefetch metadata