Create automation workflow

Dockerfile

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+####
+##
+##      Build a docker image out of the static html book generated by mdbook.
+##      Used by automation. Can be built manually for testing.
+##
+####
+FROM alpine:3.17
+RUN apk add nginx supervisor
+RUN mkdir -p /var/www
+RUN rm -rf /etc/nginx
+COPY build /var/www/build
+COPY .conf/nginx /etc/nginx
+COPY .conf/supervisor/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]
+EXPOSE 80