Add frontend build env (#9)

build-scripts/frontend-build-env/Dockerfile

@@ -0,0 +1,24 @@
+FROM ubuntu:16.04
+
+# setup locals
+RUN apt-get update && apt-get install -y \
+        locales \
+        curl \
+        apt-transport-https \
+    && rm -rf /var/lib/apt/lists/* \
+    && ln -s /usr/bin/nodejs /usr/bin/node
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+
+# install yaml
+RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
+    && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
+    && apt-get update && apt-get install -y \
+        nodejs \
+        npm \
+        yarn \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY run-build.sh /
+
+WORKDIR /hassio