Merge pull request #885 from nagisa77/codex/separate-redis-databases-for-environments

feat: allow redis database override

backend/src/main/resources/application.properties

@@ -12,7 +12,7 @@ spring.jpa.hibernate.ddl-auto=update
 # for redis
 spring.data.redis.host=${REDIS_HOST:localhost}
 spring.data.redis.port=${REDIS_PORT:6379}
-spring.data.redis.database=0
+spring.data.redis.database=${REDIS_DATABASE:0}
 
 # for jwt
 app.jwt.secret=${JWT_SECRET:jwt_sec}