Update scripts for Ubuntu Focal

Author: philwebb

Dockerfile

@@ -5,8 +5,11 @@ ARG jar=target/github-changelog-generator.jar
 
 COPY ${jar} /github-changelog-generator.jar
 
+RUN export DEBIAN_FRONTEND=noninteractive
 RUN apt-get update
-RUN apt-get install --no-install-recommends -y ca-certificates curl
+RUN apt-get install --no-install-recommends -y tzdata ca-certificates curl
+RUN ln -fs /usr/share/zoneinfo/UTC /etc/localtime
+RUN dpkg-reconfigure --frontend noninteractive tzdata
 RUN rm -rf /var/lib/apt/lists/*
 
 ENV JAVA_HOME /opt/openjdk

ci/images/setup.sh

@@ -1,12 +1,16 @@
 #!/bin/bash
 set -ex
 
+export DEBIAN_FRONTEND=noninteractive
+
 ###########################################################
 # UTILS
 ###########################################################
 
 apt-get update
-apt-get install --no-install-recommends -y ca-certificates net-tools libxml2-utils git curl
+apt-get install --no-install-recommends -y tzdata ca-certificates net-tools libxml2-utils git curl
+ln -fs /usr/share/zoneinfo/UTC /etc/localtime
+dpkg-reconfigure --frontend noninteractive tzdata
 rm -rf /var/lib/apt/lists/*
 
 curl https://raw.githubusercontent.com/spring-io/concourse-java-scripts/v0.0.2/concourse-java.sh > /opt/concourse-java.sh