Use the 8-jre-alpine image for smaller downloads

I have been doing some testing with a Dockerized master built off of OpenJDK 8 JRE rather than the JDK, and haven't found any issues. This saves almost 20MB off the download which is IMHO worth it. jenkins/jenkins 8-jre 583c435f816c 6 minutes ago 200MB jenkins/jenkins 8-jdk cc1259cdb95e 9 minutes ago 219MB
2018-02-23 14:42:59 -08:00
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-FROM openjdk:8-jdk-alpine
+FROM openjdk:8-jre-alpine

 RUN apk add --no-cache git openssh-client curl unzip bash ttf-dejavu coreutils tini