Add build config

docker/Dockerfile.dev

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+FROM alpine:3.10.3 as builder
+
+COPY ./docker/provide-crystal-alpine /opt/provision/provide-crystal-alpine
+
+# Install crystal and dev libs
+RUN /opt/provision/provide-crystal-alpine

docker/Dockerfile.prod

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+FROM alpine:3.10.3
+
+ENV BASE_PATH /opt/dayoff
+
+RUN apk add -u tzdata
+
+COPY ./build/dayoff /app/
+COPY ./public /app/public/
+
+WORKDIR /app
+
+EXPOSE 3000
+
+CMD ["/app/dayoff"]

docker/provide-crystal-alpine

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+#!/usr/bin/env sh
+
+# Install crystal and dev libs
+apk add -u \
+	make  \
+	crystal \
+	shards \
+	tzdata \
+	libc-dev \
+	zlib-dev \
+	libressl-dev \
+	yaml-dev