build: add more configuration data to the .env file

update .env.sample to support the new data and make the ddl-auto be set by an env variable

Author: vianavitor-dev

.env.sample

@@ -2,3 +2,5 @@ DATABASE_URL=<your-db-url>
 DATABASE_USER=<your-db-user>
 DATABASE_PASSWORD=<your-db-password>
 BOOK_IMAGE_PATH=<path>
+JWT_TOKEN_SECRET=<secret>
+DDL_AUTO=<ddl-option>

src/main/resources/application.properties

@@ -7,7 +7,7 @@ spring.config.import=optional:file:.env[.properties]
 spring.datasource.url=${DATABASE_URL}
 spring.datasource.username=${DATABASE_USER}
 spring.datasource.password=${DATABASE_PASSWORD}
-spring.jpa.hibernate.ddl-auto=update
+spring.jpa.hibernate.ddl-auto=${DDL_AUTO:update}
 
 spring.jpa.show-sql=true
 spring.jpa.properties.hibernate.format_sql=true