Add formatting docker image

latex/fmt/Dockerfile

@@ -0,0 +1,10 @@
+FROM alpine
+
+WORKDIR /root
+
+RUN apk add texlive-binextra perl-file-homedir perl-yaml-tiny
+
+COPY ./format.sh /root/
+RUN chmod +x /root/format.sh
+
+CMD [ "/root/format.sh" ]