Add Dockerfile (#650)

docker/Dockerfile

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+FROM alpine AS build
+
+RUN apk add --no-cache --virtual=.build gcc libc-dev make bison flex readline-dev libxml2-dev git automake autoconf libtool pkgconf coreutils
+COPY . /augeas
+RUN set -ex ; \
+    cd augeas \
+ && ./autogen.sh --prefix=/opt/augeas \
+ && make \
+ && make install
+
+FROM alpine
+RUN apk add --no-cache libgcc libxml2 readline bash
+COPY --from=build /opt/augeas /opt/augeas
+ENV PATH=$PATH:/opt/augeas/bin
+RUN set -x ; \
+    cd /opt/augeas/bin \
+ && for TOOL in augcheck auggrep augload augloadone augparsediff augsed ; \
+    do \
+      wget https://raw.githubusercontent.com/raphink/augeas-sandbox/master/"$TOOL" ; \
+      chmod +x "$TOOL" ; \
+    done
+CMD augtool

docker/README.md

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+Building the image
+------------------
+
+First clone augeas repository then, build the image:
+
+```shell
+git clone https://github.com/hercules-team/augeas.git
+cd augeas
+docker build -t augeas -f docker/Dockerfile .
+```
+
+Using the image
+---------------
+
+Here is an exemple to print ssh configuration:
+
+```shell
+docker container run -ti --rm -v /etc/ssh/:/etc/ssh augeas augtool print /files/etc/ssh
+```