docker: starting out a dockerfile

Dockerfile

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+FROM ruby:2.5-alpine
+WORKDIR /usr/src/app
+
+LABEL org.squib.url=http://squib.rocks \
+      org.squib.github=https://github.com/andymeneely/squib
+
+RUN apk --no-cache add --update \
+    ruby-dev \
+    build-base \
+    libxml2-dev \
+    libxslt-dev \
+    pcre-dev \
+    libffi-dev \
+    cairo
+
+# Just for devving on
+COPY . /app
+
+CMD ["sh"]
+
+# RUN gem install \
+#     squib \
+#     -- --use-system-libraries
+
+# NOTE: STILL UNDER DEVELOPMENT! Don't use this just yet.