Merge pull request #32 in LCL/wolframengineforpython from feature/ECE-553-add-Dockerfile to master

* commit '0960225dc4855a8efc4d41cb537066b9d21fc12f':
  Change `pip3` to `python3 -m pip` in Dockerfile
  Add some linebreaks to README.md
  Condense some RUN commands in the Dockerfile
  Add information on Docker image to README.md
  Add Dockerfile

Author: okofish

Dockerfile

@@ -0,0 +1,18 @@
+FROM wolframresearch/wolframengine:latest
+
+USER root
+
+RUN apt-get update -y && \
+  apt-get install -y python3 python3-pip && \
+  python3 -m pip install wolframclient
+
+COPY . /tmp/build
+RUN pip3 install /tmp/build && \
+  rm -r /tmp/build && \
+  chown -R wolframengine /srv
+
+USER wolframengine
+EXPOSE 18000
+
+ENTRYPOINT ["/usr/bin/python3", "-m", "wolframwebengine", "--domain", "0.0.0.0"]
+CMD ["/srv"]

README.md

@@ -148,6 +148,33 @@ http://localhost:18000/static.json
 One advantage of a multi-file application structure is that is very easy to extend the application. You can simply place new files into the appropriate location in your application directory and they will automatically be served.
 
 
+## Using Docker
+
+Wolfram Web Engine for Python is available as [a container image from Docker Hub](https://hub.docker.com/r/wolframresearch/wolframwebengineforpython) for use in containerized environments.
+
+This image is based on the [official Wolfram Engine Docker image](https://hub.docker.com/r/wolframresearch/wolframengine); information on product activation and license terms
+is available on the [Docker Hub page](https://hub.docker.com/r/wolframresearch/wolframengine) for the latter image.
+
+```
+# exposes the server on port 8080 of the host machine
+>>> docker run -ti -p 8080:18000 wolframresearch/wolframwebengineforpython --demo
+
+# serve files from the /srv directory
+>>> docker run -ti -p 8080:18000 wolframresearch/wolframwebengineforpython /srv
+```
+
+The commands above do not include activation/licensing configuration; see the [official Wolfram Engine Docker image](https://hub.docker.com/r/wolframresearch/wolframengine) for information on activating the Wolfram Engine kernel.
+
+
+Note regarding on-demand licensing: As Wolfram Web Engine for Python does not use WolframScript, the `-entitlement` command-line option and the `WOLFRAMSCRIPT_ENTITLEMENTID`
+environment variable cannot be used to pass an on-demand license entitlement ID to the Wolfram Engine kernel inside this image.
+As a workaround, the `WOLFRAMINIT` environment variable can be set to pass both the entitlement ID and the license server address to the kernel:
+
+```
+>>> docker run -ti -p 8080:18000 --env WOLFRAMINIT='-pwfile !cloudlm.wolfram.com -entitlement O-WSTD-DA42-GKX4Z6NR2DSZR' wolframresearch/wolframwebengineforpython --demo
+```
+
+
 ## Options
 
 ```