create docker image for acme-certbot

dockerfiles/tasks/acme-certbot/Dockerfile

@@ -0,0 +1,15 @@
+FROM ubuntu:focal
+MAINTAINER Richard Morgan <r_morgan@sympatico.ca>
+
+WORKDIR /opt/project
+
+EXPOSE 80
+
+RUN apt-get update && apt-get install -y software-properties-common \
+  && add-apt-repository universe && apt-get update && apt-get install -y \
+    certbot \
+    \
+  && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+ENV TERM=xterm
+ENTRYPOINT ["/usr/bin/certbot"]