Adding a Zulu JDK 7 environment

its/environments/zulu-jdk7/Dockerfile

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+FROM azul/zulu-openjdk:7
+
+RUN apt-get update &&\
+    apt-get upgrade -y ca-certificates &&\
+    apt-get install -y --no-install-recommends git curl &&\
+    rm -rf /var/lib/apt/lists/*
+
+ARG MAVEN_VERSION=3.3.9
+ARG USER_HOME_DIR="/root"
+
+RUN mkdir -p /usr/share/maven /usr/share/maven/ref \
+  && curl -fsSL http://apache.osuosl.org/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz \
+    | tar -xzC /usr/share/maven --strip-components=1 \
+  && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
+
+ENV MAVEN_HOME /usr/share/maven
+ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"