Add missing esl-erlang package to Dockerfile

priv/build/debian_10/Dockerfile

@@ -18,7 +18,7 @@ RUN \
   dpkg -i erlang-solutions_2.0_all.deb && \
   rm erlang-solutions_2.0_all.deb && \
   apt-get update -y && \
-  apt-get install -y elixir
+  apt-get install -y esl-erlang elixir
 
 RUN apt-get install -y curl build-essential && \
     curl -fsSL https://deb.nodesource.com/setup_lts.x | bash - && \