Add pipeline config + docker stuff

.buildkite/pipeline.yml

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+steps:
+  - name: Build
+    command: docker build -t js-ipfs:$BUILDKITE_COMMIT .
+
+  - wait
+
+  - name: Test
+    command: docker run -it js-ipfs:$BUILDKITE_COMMIT --entrypoint=npm test
+
+  - wait
+
+  - name: Push
+    command: echo "Eh, pushing I guess?"

.dockerignore

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+node_modules/

Dockerfile

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+FROM victorbjelkholm/chromium-xvfb-js:latest
+
+# Dependency for phantomjs
+RUN apt-get update && apt-get install bzip2
+
+WORKDIR /usr/src/app
+
+COPY package.json /usr/src/app/package.json
+
+RUN npm install --loglevel=http
+
+COPY . /usr/src/app