Update instructions for Explorer

incubating/mq-explorer/Dockerfile

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+# © Copyright IBM Corporation 2015, 2017
+#
+# Licensed 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 ubuntu:16.04
+
+# The URL to download the MQ installer from in tar.gz format
+ARG MQ_URL=https://public.dhe.ibm.com/ibmdl/export/pub/software/websphere/messaging/mqadv/mqadv_dev903_ubuntu_x86-64.tar.gz
+
+# The MQ packages to install
+ARG MQ_PACKAGES="ibmmq-explorer"
+
+RUN export DEBIAN_FRONTEND=noninteractive \
+  && apt-get update \
+  && apt-get install -y \
+    libgtk2.0-0 \
+    libxtst6
+
+ADD install-mq.sh /usr/local/bin/
+RUN chmod u+x /usr/local/bin/install-mq.sh \
+  && install-mq.sh
+
+ENV LANG=en_US.UTF-8
+
+# Run as mqm (999)
+USER 999
+
+ENTRYPOINT ["MQExplorer"]