Use multi-stage build for Docker

Author: birgirst

Dockerfile

@@ -1,6 +1,22 @@
-FROM python:alpine
+FROM python:3.6-alpine3.7 as common
 MAINTAINER [email protected]
+# Install any binary package dependencies here
+RUN apk --no-cache add \
+    yaml
+
+FROM common as build
+# Install build tools, and build wheels of all dependencies
+RUN apk --no-cache add \
+    build-base \
+    git \
+    yaml-dev
 COPY . /ais
 WORKDIR /ais
-RUN pip install .
+RUN pip wheel . --wheel-dir=/wheels/
+
+FROM common as production
+# Get rid of all build dependencies, install application using only pre-built binary wheels
+COPY --from=build /wheels/ /wheels/
+RUN pip install --no-index --find-links=/wheels/ --only-binary all /wheels/fiaas_ais*.whl
+EXPOSE 5000
 CMD ["ais"]