switch to non-root user in container

minecraft/.dockerignore

@@ -0,0 +1 @@
+world/

minecraft/Dockerfile

@@ -1,17 +1,19 @@
 FROM ubuntu:22.04
 
-WORKDIR /root
-
 RUN apt-get update && apt-get upgrade
 RUN apt-get install -y wget openjdk-18-jre
 
+RUN useradd -m matt
+USER matt
+WORKDIR /home/matt
+
 RUN wget https://github.com/Tiiffi/mcrcon/releases/download/v0.7.2/mcrcon-0.7.2-linux-x86-64.tar.gz
 RUN tar xvf mcrcon-0.7.2-linux-x86-64.tar.gz
 
 # from https://www.minecraft.net/en-us/download/server (currently 1.20.1)
 RUN wget https://piston-data.mojang.com/v1/objects/84194a2f286ef7c14ed7ce0090dba59902951553/server.jar
 
-COPY eula.txt ./
-COPY entry.sh ./
-COPY server.properties ./
-COPY ops.json ./
+COPY --chown=matt:matt eula.txt ./
+COPY --chown=matt:matt entry.sh ./
+COPY --chown=matt:matt server.properties ./
+COPY --chown=matt:matt ops.json ./