Optimize docker image

* Use 2 stage docker building to produce a tiny python3-slim based docker image with just the compilation results.

.dockerignore

@@ -0,0 +1,45 @@
+.git
+.gitignore
+Dockerfile
+
+#
+#
+#     COPIED FROM .gitignore , please keep it in sync
+#
+#
+
+# Logs
+logs
+*.log
+*.swp
+*.swo
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
+node_modules
+
+# Ignore build files
+public
+/errorShots
+/old
+/build

Dockerfile

@@ -1,21 +1,22 @@
-FROM node:10-slim
+FROM node:10 as builder
+WORKDIR /maputnik
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    git \
-    python \
- && rm -rf /var/lib/apt/lists/*
+# Only copy package.json to prevent npm install from running on every build
+COPY package.json package-lock.json ./
+RUN npm install
 
-EXPOSE 8888
-
-ENV HOME /maputnik
-RUN mkdir ${HOME}
-
-COPY . ${HOME}/
-
-WORKDIR ${HOME}
-
-RUN npm install -d
+# Build maputnik
+# TODO:  we should also do a   npm run test   here (needs more dependencies)
+COPY . .
 RUN npm run build
 
-WORKDIR ${HOME}/build/build
-CMD python -m SimpleHTTPServer 8888
+#---------------------------------------------------------------------------
+
+# Create a clean python-based image with just the build results
+FROM python:3-slim
+WORKDIR /maputnik
+
+COPY --from=builder /maputnik/build/build .
+
+EXPOSE 8888
+CMD python -m http.server 8888

README.md

@@ -26,6 +26,13 @@ Mapbox has built one of the best and most amazing OSS ecosystems. A key componen
 ## Donations
 If you or your organisation has seen value from Maputnik, please consider donating at <https://maputnik.github.io/donate>
 
+## Using
+
+The quickest way is to use docker, even without cloning the repo.  Run this command and open your browser to http://localhost:8888 .  Ctrl+C to stop the server.
+
+```bash
+docker run -it -p 8888:8888 maputnik
+```
 
 ## Documentation
 

package.json

@@ -17,6 +17,9 @@
     "url": "https://github.com/maputnik/editor"
   },
   "author": "Lukas Martinelli",
+  "contributors": [
+    "Yuri Astrakhan <YuriAstrakhan@gmail.com>"
+  ],
   "license": "MIT",
   "homepage": "https://github.com/maputnik/editor#readme",
   "dependencies": {