try fix MSI with App Service

azure-spring-boot-tests/azure-spring-boot-test-application/src/main/java/com/microsoft/azure/config/IncreaseStartupTimeHelper.java

@@ -0,0 +1,33 @@
+/**
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See LICENSE in the project root for
+ * license information.
+ */
+package com.microsoft.azure.keyvault.spring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.context.config.ConfigFileApplicationListener;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.core.Ordered;
+import org.springframework.core.env.ConfigurableEnvironment;
+
+public class IncreaseStartupTimeHelper implements EnvironmentPostProcessor, Ordered {
+
+    public static final int DEFAULT_ORDER = ConfigFileApplicationListener.DEFAULT_ORDER;
+    private int order = DEFAULT_ORDER;
+
+    @Override
+    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
+        try {
+            Thread.sleep(100_000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    public int getOrder() {
+        return order;
+    }
+
+}