Fixed saving the spigot API instead of the actual server file

run_server.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-if [ "$#" -le 1 ]; then
+if [ "$#" -lt 1 ]; then
     echo "Using default spigot version 1.21.10"
     export REV=1.21.10
 else
@@ -19,7 +19,7 @@ docker run --rm -it \
     -p 25565:25565 \
     -e MAVEN_CONFIG=/var/maven/.m2 \
     -e M2_PATH=/var/maven/.m2 \
-    --volume "$SCRIPT_DIR/build:/build" \
+    --volume "$BUILD_DIRECTORY:/build" \
     --volume "$WORKSPACE:/workspace" \
     --volume "$M2_DIRECTORY:/var/maven/.m2" \
     --volume "$SCRIPT_DIR/scripts:/scripts" \