add Dockerfile to run it from Docker

Author: vemonet

Dockerfile

@@ -0,0 +1,14 @@
+FROM debian
+
+RUN apt update -y && \
+  apt upgrade -y && \
+  apt install curl -y
+
+WORKDIR app
+
+COPY gh-md-toc .
+
+RUN chmod +x gh-md-toc
+
+ENTRYPOINT ["./gh-md-toc"]
+CMD []