Add java15 image

java15/Dockerfile

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+#
+# Copyright (c) 2020 Matthew Penner
+#
+# This repository is licensed under the MIT License.
+# https://github.com/matthewpi/images/blob/master/LICENSE.md
+#
+
+FROM        adoptopenjdk/openjdk15-openj9:alpine
+
+LABEL       author="Matthew Penner" maintainer="matthew@pterodactyl.io"
+
+RUN         apk add --update --no-cache curl ca-certificates openssl git tar bash sqlite fontconfig tzdata \
+			    && adduser -D -h /home/container container
+
+USER        container
+ENV         USER=container HOME=/home/container
+WORKDIR     /home/container
+
+COPY        ./entrypoint.sh /entrypoint.sh
+CMD         [ "/bin/ash", "/entrypoint.sh" ]

java15/entrypoint.sh

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+#!/bin/ash
+
+#
+# Copyright (c) 2020 Matthew Penner
+#
+# This repository is licensed under the MIT License.
+# https://github.com/matthewpi/images/blob/master/LICENSE.md
+#
+
+# Default the TZ environment variable to UTC.
+TZ=${TZ:-UTC}
+export TZ
+
+# Switch to the container's working directory
+cd /home/container
+
+# Set environment variable that holds the Internal Docker IP
+export INTERNAL_IP=`ip route get 1 | awk '{print $NF;exit}'`
+
+# Print Java version
+java -version
+
+# Replace variables in the startup command
+MODIFIED_STARTUP=`eval echo $(echo ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g')`
+echo "[container@pterodactyl ~]$ ${MODIFIED_STARTUP}"
+
+# Run the startup command
+eval ${MODIFIED_STARTUP}