feat: store backup sizes in metadata file

Dockerfile

@@ -47,13 +47,15 @@ COPY --from=builder /app/target/debug/alex /bin/alex
 RUN chmod +x /bin/alex
 
 # Default value to keep users from eating up all ram accidentally
-ENV ALEX_XMS=1024 \
+ENV ALEX_CONFIG_DIR=/app/config \
+    ALEX_WORLD_DIR=/app/worlds \
+    ALEX_BACKUP_DIR=/app/backups \
+    ALEX_SERVER=paper \
+    ALEX_XMS=1024 \
     ALEX_XMX=2048 \
     ALEX_JAR=/app/server.jar \
-    ALEX_CONFIG_DIR=/app/config \
-    ALEX_WORLD_DIR=/app/worlds \
-    ALEX_BACKUPS_DIR=/app/backups \
-    ALEX_SERVER_VERSION="${MC_VERSION}-${PAPERMC_VERSION}"
+    ALEX_SERVER_VERSION="${MC_VERSION}-${PAPERMC_VERSION}" \
+    ALEX_LAYERS="2min,2,4,4;3min,3,2,2"
 
 # Document exposed ports
 EXPOSE 25565
@@ -62,4 +64,4 @@ EXPOSE 25565
 USER paper:paper
 
 ENTRYPOINT ["/bin/dumb-init", "--"]
-CMD ["/bin/alex", "paper"]
+CMD ["/bin/alex", "run"]