Update with latest definition

.devcontainer/Dockerfile

@@ -1,12 +1,4 @@
-#-------------------------------------------------------------------------------------------------------------
-# Copyright (c) Microsoft Corporation. All rights reserved.
-# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
-#-------------------------------------------------------------------------------------------------------------
-
-FROM mcr.microsoft.com/java/jdk:8u232-zulu-ubuntu
-
-# Avoid warnings by switching to noninteractive
-ENV DEBIAN_FRONTEND=noninteractive
+FROM openjdk:8-jdk
 
 # This Dockerfile adds a non-root user with sudo access. Use the "remoteUser"
 # property in devcontainer.json to use it. On Linux, the container user's GID/UIDs
@@ -16,46 +8,40 @@ ARG USERNAME=vscode
 ARG USER_UID=1000
 ARG USER_GID=$USER_UID
 
-# Maven settings
 ARG MAVEN_VERSION=3.6.3
 ARG MAVEN_SHA=c35a1803a6e70a126e80b2b3ae33eed961f83ed74d18fcd16909b2d44d7dada3203f1ffe726c17ef8dcca2dcaa9fca676987befeadc9b9f759967a8cb77181c0
-ENV MAVEN_HOME=/usr/local/share/maven
-COPY maven-settings.xml ${MAVEN_HOME}/ref/
 
-# Configure apt and install packages
+COPY maven-settings.xml /usr/share/maven/ref/
+ENV MAVEN_HOME /usr/share/maven
+ENV MAVEN_CONFIG /root/.m2
+
+# Configure apt
+ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update \
     && apt-get -y install --no-install-recommends apt-utils dialog 2>&1 \
     #
-    # Verify git and needed tools are installed
-    && apt-get -y install \
-        git \
-        iproute2 \
-        procps \
-        curl \
-        apt-transport-https \
-        gnupg2 \
-        lsb-release \
-    #
     # Create a non-root user to use if preferred - see https://aka.ms/vscode-remote/containers/non-root-user.
     && groupadd --gid $USER_GID $USERNAME \
-    && useradd -s /bin/bash --uid ${USER_UID} --gid ${USER_GID} -m $USERNAME \
+    && useradd -s /bin/bash --uid $USER_UID --gid $USER_GID -m $USERNAME \
     # [Optional] Add sudo support for the non-root user
     && apt-get install -y sudo \
     && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME\
     && chmod 0440 /etc/sudoers.d/$USERNAME \
-    # 
+    #
+    # Verify git, needed tools installed
+    && apt-get -y install git openssh-client less iproute2 procps curl lsb-release \
+    #
     # Install Maven
-    && mkdir -p ${MAVEN_HOME} ${MAVEN_HOME}/ref \
+    && mkdir -p /usr/share/maven /usr/share/maven/ref \
     && curl -fsSL -o /tmp/apache-maven.tar.gz https://archive.apache.org/dist/maven/maven-3/${MAVEN_VERSION}/binaries/apache-maven-${MAVEN_VERSION}-bin.tar.gz \
     && echo "${MAVEN_SHA} /tmp/apache-maven.tar.gz" | sha512sum -c - \
-    && tar -xzf /tmp/apache-maven.tar.gz -C ${MAVEN_HOME} --strip-components=1 \
+    && tar -xzf /tmp/apache-maven.tar.gz -C /usr/share/maven --strip-components=1 \
     && rm -f /tmp/apache-maven.tar.gz \
-    && ln -s ${MAVEN_HOME}/bin/mvn /usr/local/bin/mvn \
+    && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn \
     #
     # Clean up
     && apt-get autoremove -y \
     && apt-get clean -y \
     && rm -rf /var/lib/apt/lists/*
 
-# Switch back to dialog for any ad-hoc use of apt-get
-ENV DEBIAN_FRONTEND=dialog
+ENV DEBIAN_FRONTEND=dialog