Add main application class and test configuration for Spring Boot app

server/app/src/main/java/fr/bureauservice/app/PortailApplication.java

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+package fr.bureauservice.app;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class PortailApplication {
+
+    static void main(String[] args) {
+        SpringApplication.run(PortailApplication.class, args);
+    }
+
+}

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

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+spring.application.name=app

server/app/src/test/java/fr/bureauservice/app/PortailApplicationTests.java

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+package fr.bureauservice.app;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class PortailApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}