Merge pull request #681 from jonbullock/change/add-dockerfile

Added Dockerfile and updated README

.dockerignore

@@ -0,0 +1,3 @@
+/build
+/jbake-dist/build
+.gradle

Dockerfile

@@ -0,0 +1,36 @@
+FROM gradle:6.8-jdk11 as builder
+
+LABEL maintainer="https://jbake.org/community/team.html"
+
+ENV JBAKE_HOME=/opt/jbake
+
+RUN mkdir -p ${JBAKE_HOME}
+COPY . /usr/src/jbake
+
+RUN set -o errexit -o nounset \
+    && echo "Building JBake" \
+    && cd /usr/src/jbake \
+    && gradle --no-daemon installDist \
+    && cp -r jbake-dist/build/install/jbake/* $JBAKE_HOME \
+    && rm -r ~/.gradle /usr/src/jbake
+
+FROM adoptopenjdk/openjdk11:alpine-jre
+
+ENV JBAKE_USER=jbake
+ENV JBAKE_HOME=/opt/jbake
+ENV PATH ${JBAKE_HOME}/bin:$PATH
+
+RUN adduser -D -u 1000 -g "" ${JBAKE_USER} ${JBAKE_USER}
+
+USER ${JBAKE_USER}
+
+COPY --from=builder /opt/jbake /opt/jbake
+
+WORKDIR /mnt/site
+
+VOLUME ["/mnt/site"]
+
+ENTRYPOINT ["jbake"]
+CMD ["-b"]
+
+EXPOSE 8820

README.asciidoc

@@ -54,6 +54,43 @@ Talk to other users of JBake on the forum:
 
 * http://groups.google.com/group/jbake-user[Forum]
 
+== Docker Image
+
+The image uses the official https://hub.docker.com/r/adoptopenjdk/openjdk11/[adoptopenjdk/openjdk11:alpine] image
+for building a distribution of JBake and
+https://hub.docker.com/r/adoptopenjdk/openjdk11/[adoptopenjdk/openjdk11:alpine-jre] for runtime.
+
+=== Build
+
+To build the Docker image:
+
+----
+$ docker build -t jbake/jbake:latest .
+----
+
+=== Usage
+
+To execute JBake via Docker run this from project directory:
+
+----
+$ docker run --rm -u jbake -v "$PWD":/mnt/site jbake/jbake:latest
+----
+
+This command will execute using the jbake user to avoid running as root and will mount the current working directory as `/mnt/site`
+in the Docker container where JBake is expecting your project files to be. By default the Docker image will execute a bake `-b` only.
+
+If you want to bake and serve your project using the Docker image then you'll need to override the default command:
+
+----
+$ docker run --rm -u jbake -v "$PWD":/mnt/site -p 8820:8820 jbake/jbake:latest -b -s
+----
+
+This command will also expose port 8820 from the container, you'll also need to set the following option in your `jbake.properties` file:
+
+----
+server.hostname=0.0.0.0
+----
+
 == Build System
 
 The project uses http://gradle.org[Gradle] 4.9+ as the build system.