Add docker-compose for local dev stack

Add a docker-compose.yml to run a local development stack: Postgres (with mounted init scripts), Redis, MinIO, Keycloak (start-dev) and pgAdmin, plus a bridge network and persistent volumes. Also add init/init.sql to create the keycloak database and grant privileges to the admin user so Keycloak can connect to its dedicated DB. Default credentials and port mappings are provided for development convenience.

docker-compose.yml

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+version: '3.8'
+
+services:
+  postgres:
+    image: postgres:15-alpine
+    container_name: postgres
+    restart: unless-stopped
+    ports:
+      - "5432:5432"
+    environment:
+      POSTGRES_USER: admin
+      POSTGRES_PASSWORD: admin
+      POSTGRES_DB: postgres
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./init:/docker-entrypoint-initdb.d   # place init.sql here to create additional databases
+    networks:
+      - backend
+
+  redis:
+    image: redis:7-alpine
+    container_name: redis
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_data:/data
+    networks:
+      - backend
+
+  minio:
+    image: minio/minio:latest
+    container_name: minio
+    restart: unless-stopped
+    ports:
+      - "9000:9000"      # API
+      - "9001:9001"      # Web console
+    environment:
+      MINIO_ROOT_USER: minioadmin
+      MINIO_ROOT_PASSWORD: minioadmin
+    volumes:
+      - minio_data:/data
+    command: server /data --console-address ":9001"
+    networks:
+      - backend
+
+  keycloak:
+    image: quay.io/keycloak/keycloak:latest
+    container_name: keycloak
+    restart: unless-stopped
+    ports:
+      - "8180:8080"      # Host port 8180 → container 8080 (Keycloak default)
+    environment:
+      KEYCLOAK_ADMIN: admin
+      KEYCLOAK_ADMIN_PASSWORD: admin
+      KC_DB: postgres
+      KC_DB_URL: jdbc:postgresql://postgres:5432/keycloak
+      KC_DB_USERNAME: admin
+      KC_DB_PASSWORD: admin
+    command: start-dev   # Use start-dev for development mode
+    depends_on:
+      - postgres
+    networks:
+      - backend
+
+  pgadmin:
+    image: dpage/pgadmin4:latest
+    container_name: pgadmin
+    restart: unless-stopped
+    ports:
+      - "5050:80"        # pgAdmin web UI
+    environment:
+      PGADMIN_DEFAULT_EMAIL: admin@example.com
+      PGADMIN_DEFAULT_PASSWORD: admin
+    volumes:
+      - pgadmin_data:/var/lib/pgadmin
+    depends_on:
+      - postgres
+    networks:
+      - backend
+
+networks:
+  backend:
+    driver: bridge
+
+volumes:
+  postgres_data:
+  redis_data:
+  minio_data:
+  pgadmin_data:

init/init.sql

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+CREATE DATABASE keycloak;
+GRANT ALL PRIVILEGES ON DATABASE keycloak TO admin;