Initial commit for Postgres Operator UI (#613)

* Initial commit for our basic Postgres Operator UI:
 * Create and modify Postgres manifests
 * Watch Operator Logs in the UI
 * Observe cluster creation progress
 * S3 Backup browser for clone and restore

Many thanks to Manuel Gomez and Jan Mussler for the initial UI work a long time ago!

ui/Dockerfile

@@ -0,0 +1,40 @@
+FROM alpine:3.6
+MAINTAINER team-acid@zalando.de
+
+EXPOSE 8080
+
+RUN \
+  apk add --no-cache \
+    alpine-sdk \
+    autoconf \
+    automake \
+    ca-certificates \
+    libffi-dev \
+    libtool \
+    python3 \
+    python3-dev \
+    zlib-dev \
+    && \
+  python3 -m ensurepip && \
+  rm -r /usr/lib/python*/ensurepip && \
+  pip3 install --upgrade \
+    gevent \
+    jq \
+    pip \
+    setuptools \
+    && \
+  rm -rf \
+    /root/.cache \
+    /tmp/* \
+    /var/cache/apk/*
+
+COPY requirements.txt /
+RUN pip3 install -r /requirements.txt
+
+COPY operator_ui /operator_ui
+
+ARG VERSION=dev
+RUN sed -i "s/__version__ = .*/__version__ = '${VERSION}'/" /operator_ui/__init__.py
+
+WORKDIR /
+ENTRYPOINT ["/usr/bin/python3", "-m", "operator_ui"]