Configure application properties for database connection and JWT secret

server/app/src/main/resources/application.properties

@@ -1 +1,12 @@
 spring.application.name=app
+
+spring.config.import=optional:file:.env[.properties]
+
+spring.datasource.url=${MYSQL_URL}
+spring.datasource.username=${MYSQL_USER}
+spring.datasource.password=${MYSQL_PASS}
+
+spring.jpa.hibernate.ddl-auto=update
+spring.jpa.show-sql=true
+
+jwt.secret=5c6fbfca8ab9a88c4c6308cc8fd7f4f57543cb072e4db605a718d65d3fa16509