Migrate from OpenJDK to Zulu (#293)

Dockerfile

@@ -2,13 +2,14 @@ FROM ubuntu:bionic
 
 ARG python=3.8
 
-ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64
+ENV JAVA_HOME /usr/lib/jvm/zulu-8-amd64
 ENV LC_ALL en_US.UTF-8
 ENV TZ Etc/UTC
 
 RUN apt-get update && \
     apt-get install --no-install-recommends -y \
         gpg-agent \
+        dirmngr \
         locales \
         software-properties-common \
         wget \
@@ -17,11 +18,13 @@ RUN apt-get update && \
     echo $TZ > /etc/timezone && \
     locale-gen $LC_ALL && \
     update-locale && \
-    add-apt-repository ppa:deadsnakes/ppa && \
+    add-apt-repository ppa:deadsnakes/ppa -y && \
     wget -q https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb -O packages-microsoft-prod.deb && \
     dpkg -i packages-microsoft-prod.deb && \
     wget -qO- https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
     wget -qO- https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list && \
+    apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 0xB1998361219BD9C9 && \
+    add-apt-repository "deb http://repos.azulsystems.com/ubuntu stable main" -y && \
     apt-get update && \
     apt-get install --no-install-recommends -y \
         git \
@@ -32,7 +35,7 @@ RUN apt-get update && \
         python${python}-dev \
         python3-setuptools \
         python3-pip \
-        openjdk-8-jdk \
+        zulu-8 \
         golang-go \
         dotnet-sdk-3.1 \
         powershell \