remove zookeeper dependency (#87)

- uses Kafka KRaft mode to run without zookeeper
- remove unnecessary port exposure

docker-compose.yml

@@ -1,46 +1,32 @@
 version: '3'
 services:
-  zookeeper:
-    image: zookeeper:3.7
-    container_name: zookeeper
-    restart: always
-    environment:
-      ALLOW_ANONYMOUS_LOGIN: "yes"
-      ZOO_ADMINSERVER_ENABLED: "false"
-    volumes:
-      - "zookeeper-data:/data"
-      - "zookeeper-datalog:/datalog"
-    networks:
-      - spectrum-network
   kafka:
-    image: bitnami/kafka:2
+    image: bitnami/kafka:3.4.0
     container_name: kafka
     restart: always
     environment:
+      KAFKA_ENABLE_KRAFT: yes
+      KAFKA_CFG_PROCESS_ROLES: "broker,controller"
       KAFKA_BROKER_ID: "1"
-      KAFKA_CFG_LISTENERS: "PLAINTEXT://:9092"
+      KAFKA_CFG_CONTROLLER_LISTENER_NAMES: "CONTROLLER"
+      KAFKA_CFG_LISTENERS: "PLAINTEXT://:9092,CONTROLLER://:9093"
       KAFKA_CFG_ADVERTISED_LISTENERS: "PLAINTEXT://kafka:9092"
-      KAFKA_CFG_ZOOKEEPER_CONNECT: zookeeper:2181
       ALLOW_PLAINTEXT_LISTENER: "yes"
+      KAFKA_CFG_CONTROLLER_QUORUM_VOTERS: "1@kafka:9093"
     volumes:
       - "kafka-data:/bitnami/kafka"
-    depends_on:
-      - zookeeper
     networks:
       - spectrum-network
   redis:
     image: redis:7.0-alpine
     container_name: redis
     restart: always
-    ports:
-      - "6379:6379"
     volumes:
       - "redis-data:/data"
     networks:
       - spectrum-network
   utxo-tracker:
     image: spectrumlabs/ergo-utxo-tracker:latest
-    container_name: utxo-tracker
     volumes:
       - "log-data:/var/log/dex-backend"
     env_file: config.env
@@ -51,7 +37,6 @@ services:
       - spectrum-network
   amm-executor:
     image: spectrumlabs/ergo-amm-executor:latest
-    container_name: amm-executor
     restart: always
     volumes:
       - "log-data:/var/log/dex-backend"
@@ -68,8 +53,6 @@ services:
       - "log-data:/var/log/dex-backend"
       - "poolresolver-data:/var/lib/pool-resolver:Z"
     env_file: config.env
-    ports:
-      - "9876:9876"
     depends_on:
       - kafka
     networks:
@@ -86,9 +69,5 @@ volumes:
     driver: local
   log-data:
     driver: local
-  zookeeper-data:
-    driver: local
-  zookeeper-datalog:
-    driver: local
   kafka-data:
     driver: local