Add Dockerfile

docker/Dockerfile.allvcs

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+FROM vladistan/autorevision:latest
+RUN apk update  && apk add subversion bzr mercurial
+WORKDIR /app
+ENTRYPOINT ["/usr/local/bin/autorevision"]

docker/Dockerfile.git

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+FROM alpine:3.10 AS builder
+RUN apk update  && apk add git bash make asciidoc gzip sed
+COPY . /build
+RUN mkdir -p /build
+WORKDIR /build
+RUN ls
+RUN make install
+
+
+
+FROM alpine:3.10
+RUN apk update  && apk add git bash
+COPY --from=builder /usr/local/bin/autorevision /usr/local/bin
+ENTRYPOINT ["/usr/local/bin/autorevision"]

docker/README.md

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+# Docker support
+
+Modern CI/CD practices discourage installing tools on build servers, even
+even simple ones like 'AutoRevision'.  The preferred method is to use
+containers.   Using containers have the following advantages:
+
+ * Less things need to be installed on build boxes.
+ * Can use different versions of tools by different build jobs,  without
+   worrying about  version clashes
+
+
+Autorevision containers are available on the docker hub in two flavors.  
+
+   1. Git only container - this container supports only git as the
+   version control software.  It's very lightweight only 26MB. This image
+   available from Dockerhub as 'vladistan/autorevision:git'
+
+
+
+   2. All VCS version - this container supports all version control
+   software that is supported by autorevision.  It's slightly larger
+   120MB image. This image available from Dockerhub as 'vladistan/autorevision:allvcs'
+
+
+Here is the example of using AutoRevision containers in the build script:
+
+```
+$ docker run -w /app -v `pwd`:/app vladistan/autorevision:git -t sh
+# Generated by autorevision - do not hand-hack!
+
+VCS_TYPE="git"
+VCS_BASENAME="app"
+VCS_UUID="aa7e8f8ee10bb859e4510f846d4d9e93c9977868"
+VCS_NUM="734"
+VCS_DATE="2019-10-13T20:52:02Z"
+VCS_BRANCH="dev"
+VCS_TAG="1.9.1"
+VCS_TAG_OPENPGP=""
+VCS_TICK="8"
+VCS_EXTRA=""
+
+VCS_ACTION_STAMP="2019-10-13T20:52:[email protected]"
+VCS_FULL_HASH="3b3f44dc67e18ff9acc54e683895d9f143e48d0b"
+VCS_COMMIT_OPENPGP=""
+VCS_SHORT_HASH="3b3f44d"
+
+VCS_WC_MODIFIED="0"
+
+# end
+```
+
+
+The example above uses GIT only version of the container,  if you want to
+use it with other type of VCS replace the first line without
+
+```
+docker run -w /app -v `pwd`:/app vladistan/autorevision:allvcs -t sh
+```