Implemented a Dockerfile (#592)

* Implemented a Dockerfile. See skywinder/github-changelog-generator#591

* Set Ferrari Marco as a maintainer

* Explicitly install the latest released version

Dockerfile

@@ -0,0 +1,16 @@
+FROM ruby:2.4-alpine3.6
+
+LABEL maintainer "ferrari.marco@gmail.com"
+
+ENV GITHUB_CHANGELOG_GENERATOR_VERSION "1.14.3"
+
+RUN gem install github_changelog_generator --version $GITHUB_CHANGELOG_GENERATOR_VERSION
+
+ENV SRC_PATH /usr/local/src/your-app
+RUN mkdir -p $SRC_PATH
+
+VOLUME [ "$SRC_PATH" ]
+WORKDIR $SRC_PATH
+
+CMD ["--help"]
+ENTRYPOINT ["github_changelog_generator"]

README.md

@@ -47,6 +47,10 @@ release (or version) of the project."
 
 See also Troubleshooting.
 
+## Running with Docker
+
+    docker run -it --rm -v "$(pwd)":/usr/local/src/your-app skywinder/github-changelog-generator
+
 ## Output example
 
 - Look at **[CHANGELOG.md](https://github.com/skywinder/Github-Changelog-Generator/blob/master/CHANGELOG.md)** for this project