✨ Add Cassandra support and update README.md

docker-compose-cassandra.yml

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+version: "3.9"
+
+services:
+  ohmyurl-cassandra-1:
+    container_name: "ohmyurl-cassandra-1"
+    hostname: "ohmyurl-cassandra-1"
+    build: ./config/cassandra
+    image: ohmyurl-cassandra:4
+    environment: &cassandra-environment
+      - MAX_HEAP_SIZE=4G
+      - HEAP_NEWSIZE=800M
+      - CASSANDRA_SEEDS=ohmyurl-cassandra-1,ohmyurl-cassandra-2,ohmyurl-cassandra-3
+    ports:
+      - "9042:9042"
+    volumes:
+      - cassandra_1_data:/var/lib/cassandra
+    networks:
+      - ohmyurl-net
+    init: true
+
+  ohmyurl-cassandra-2:
+    container_name: "ohmyurl-cassandra-2"
+    hostname: "ohmyurl-cassandra-2"
+    image: ohmyurl-cassandra:4
+    environment: *cassandra-environment
+    depends_on:
+      - ohmyurl-cassandra-1
+    ports:
+      - "9043:9042"
+    volumes:
+      - cassandra_2_data:/var/lib/cassandra
+    networks:
+      - ohmyurl-net
+    init: true
+
+  ohmyurl-cassandra-3:
+    container_name: "ohmyurl-cassandra-3"
+    hostname: "ohmyurl-cassandra-3"
+    image: ohmyurl-cassandra:4
+    environment: *cassandra-environment
+    depends_on:
+      - ohmyurl-cassandra-1
+    ports:
+      - "9044:9042"
+    volumes:
+      - cassandra_3_data:/var/lib/cassandra
+    networks:
+      - ohmyurl-net
+    init: true
+
+  ohmyurl-init-cassandra:
+    container_name: "ohmyurl-init-cassandra"
+    build:
+      context: ./config/cassandra
+      dockerfile: Dockerfile.init.cassandra
+    image: "ohmyurl-init-cassandra"
+    env_file:
+      - ./config/cassandra/init-cassandra.env
+    depends_on:
+      - ohmyurl-cassandra-1
+    networks:
+      - ohmyurl-net
+
+  ohmyurl-web:
+    container_name: "ohmyurl-web"
+    hostname: "ohmyurl-web"
+    build: .
+    image: ohmyurl-web:1.1
+    environment:
+      - DB=cassandra
+      - CASSANDRA_APP_LABEL=ohmyurl-1
+      - CASSANDRA_URL_START_ID=1
+      - CASSANDRA_URL_END_ID=10000
+    env_file:
+      - ./app/config/cassandra.env
+    ports:
+      - "8080:8080"
+      - "8081:8081"
+    depends_on:
+      - ohmyurl-cassandra-1
+    networks:
+      - ohmyurl-net
+    init: true
+
+  ohmyurl-nginx:
+    container_name: "ohmyurl-nginx"
+    image: nginx:1.25.3-alpine
+    ports:
+      - 80:80
+    volumes:
+      - ./config/nginx/nginx.conf:/etc/nginx/conf.d/default.conf
+    depends_on:
+      - ohmyurl-web
+    networks:
+      - ohmyurl-net
+    init: true
+
+networks:
+  ohmyurl-net:
+    driver: bridge
+
+volumes:
+  cassandra_1_data:
+  cassandra_2_data:
+  cassandra_3_data: