Java env builder with Maven (#783)

Java environment builder with support for Maven builds. Default build comman runs `mvn clean package` and picks up target/*with-dependencies.jar for function.

environments/jvm/builder/Dockerfile

@@ -0,0 +1,47 @@
+## Fission builder base image
+ARG BUILDER_IMAGE=fission/builder:latest
+FROM ${BUILDER_IMAGE}
+
+## Section copied from the OpenJDK 8 Dockerfile
+
+ENV LANG C.UTF-8
+RUN { \
+    echo '#!/bin/sh'; \
+    echo 'set -e'; \
+    echo; \
+    echo 'dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"'; \
+    } > /usr/local/bin/docker-java-home \
+    && chmod +x /usr/local/bin/docker-java-home
+ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk
+ENV PATH $PATH:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin
+
+ENV JAVA_VERSION 8u171
+ENV JAVA_ALPINE_VERSION 8.171.11-r0
+
+RUN set -x \
+    && apk add --no-cache \
+    openjdk8="$JAVA_ALPINE_VERSION" \
+    && [ "$JAVA_HOME" = "$(docker-java-home)" ]
+
+## Section copied from the Maven Dockerfile
+
+RUN apk add --no-cache curl tar bash procps
+
+ARG MAVEN_VERSION=3.5.4
+ARG USER_HOME_DIR="/root"
+ARG SHA=ce50b1c91364cb77efe3776f756a6d92b76d9038b0a0782f7d53acf1e997a14d
+ARG BASE_URL=https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries
+
+RUN mkdir -p /usr/share/maven /usr/share/maven/ref \
+    && curl -fsSL -o /tmp/apache-maven.tar.gz ${BASE_URL}/apache-maven-${MAVEN_VERSION}-bin.tar.gz \
+    && echo "${SHA}  /tmp/apache-maven.tar.gz" | sha256sum -c - \
+    && tar -xzf /tmp/apache-maven.tar.gz -C /usr/share/maven --strip-components=1 \
+    && rm -f /tmp/apache-maven.tar.gz \
+    && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
+
+ENV MAVEN_HOME /usr/share/maven
+ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"
+
+## Fission builder specific section
+ADD build.sh /usr/local/bin/build
+EXPOSE 8001