bump ubuntu 18.04->20.04 and node to 12->14

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 
 LABEL maintainer="Fred Tingaud <ftingaud@hotmail.com>"
 
@@ -15,13 +15,13 @@ RUN apt update && \
 
 RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
 RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
-RUN curl -sL https://deb.nodesource.com/setup_12.x | bash -
+RUN curl -sL https://deb.nodesource.com/setup_14.x | bash -
 RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
 
 RUN add-apt-repository \
-      "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
-      $(lsb_release -cs) \
-      stable" && \
+    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+    $(lsb_release -cs) \
+    stable" && \
     apt update && \
     apt install -y nodejs yarn docker-ce docker-ce-cli containerd.io