Fórum Erro ao dockerizar sistema em java #623681

Estou criando um sistema com Spring (Java) e MySQL, e to tentando ''''''''''''''''dockerizar'''''''''''''''' esse sistema, mas quando eu vou conectar com o banco de dados ele não conecta. O erro é este

"2025-03-03T18:05:18.871Z INFO 154 --- [Loja] [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2025-03-03T18:05:19.964Z WARN 154 --- [Loja] [ restartedMain] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 0, SQLState: 08S01
2025-03-03T18:05:19.965Z ERROR 154 --- [Loja] [ restartedMain] o.h.engine.jdbc.spi.SqlExceptionHelper : Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
2025-03-03T18:05:19.966Z WARN 154 --- [Loja] [ restartedMain] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata

org.hibernate.exception.JDBCConnectionException: unable to obtain isolated JDBC connection [Communications link failure"

meu docker-compose.yml ta assim

"version: ''''''''''''''''3''''''''''''''''
services:
loja:
image: eclipse-temurin:17-jdk-focal
ports:
- "8081:8080"
environment:
- SPRING_DATASOURCE_URL=jdbc:mysql://mysql:3306/loja
- SPRING_DATASOURCE_USERNAME=root
- SPRING_DATASOURCE_PASSWORD=123456
depends_on:
- mysql

mysql:
image: mysql:5.7
environment:
MYSQL_ROOT_PASSWORD: 123456
ports:
- "3306:3306"
"