docker image: switch to ubuntu's erlang (kofigumbs/codec-beam#49)

Looks like Ericsson dropped Bionic support

Author: juhp

docker/02-apt-get-install.sh

@@ -19,6 +19,7 @@ apt-get install -y \
     coinor-libclp-dev \
     curl \
     dvipng \
+    erlang \
     freeglut3-dev \
     freetds-dev \
     fsharp \

docker/03-custom-install.sh

@@ -18,13 +18,13 @@ update-alternatives --install "/usr/bin/ld" "ld" "/usr/bin/ld.bfd" 10
 # echo "/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server" > /etc/ld.so.conf.d/openjdk.conf \
 #     && ldconfig
 
-# Install erlang/otp platform and its dependencies
-ERLANG_DEB_FILE="esl-erlang_21.1-1~ubuntu~bionic_amd64.deb"
-pushd /tmp \
-    && wget https://packages.erlang-solutions.com/erlang/debian/pool/${ERLANG_DEB_FILE} \
-    && (dpkg -i ${ERLANG_DEB_FILE}; apt-get install -yf) \
-    && rm ${ERLANG_DEB_FILE} \
-    && popd
+# # Install erlang/otp platform and its dependencies
+# ERLANG_DEB_FILE="esl-erlang_21.1-1~ubuntu~bionic_amd64.deb"
+# pushd /tmp \
+#     && wget https://packages.erlang-solutions.com/erlang/debian/pool/${ERLANG_DEB_FILE} \
+#     && (dpkg -i ${ERLANG_DEB_FILE}; apt-get install -yf) \
+#     && rm ${ERLANG_DEB_FILE} \
+#     && popd
 
 # protoc, for proto-lens-combinators test suite
 # Instructions from: https://google.github.io/proto-lens/installing-protoc.html