Implement standalone/cli app

standalone/docker/Dockerfile

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+FROM alpine
+RUN apk add --no-cache openjdk17 netcat-openbsd
+
+# create a simple 'send' command that will allow users
+# to run, for example: docker exec <container> send lp info
+RUN printf '#!/bin/sh\n\
+echo "$@" | nc -N localhost 3000\n' >> /usr/bin/send && chmod 777 /usr/bin/send
+
+# setup user
+RUN addgroup -S app && adduser -S -G app app
+USER app
+
+# copy jar file into image
+WORKDIR /opt/luckperms
+COPY LuckPerms-Standalone-*.jar .
+RUN mv * luckperms-standalone.jar
+
+# create volume for data directory
+RUN mkdir data
+VOLUME ["/opt/luckperms/data"]
+
+CMD ["java", "-jar", "luckperms-standalone.jar", "--docker"]