Add tests for WhisperServerService#run

Additionally, `LocalWhisperServerService` may be used for integration testing.

service/src/test/java/org/whispersystems/textsecuregcm/LocalWhisperServerService.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm;
+
+import io.dropwizard.util.Resources;
+
+/**
+ * This class may be run directly from a correctly configured IDE, or using the command line:
+ * <p>
+ * <code>./mvnw clean integration-test -DskipTests=true -Ptest-server</code>
+ * <p>
+ * <strong>NOTE: many features are non-functional, especially those that depend on external services</strong>
+ */
+public class LocalWhisperServerService {
+
+  public static void main(String[] args) throws Exception {
+
+    System.setProperty("secrets.bundle.filename",
+        Resources.getResource("config/test-secrets-bundle.yml").getPath());
+    System.setProperty("sqlite.dir", "service/target/lib");
+    System.setProperty("aws.region", "local-test-region");
+
+    new WhisperServerService().run("server", Resources.getResource("config/test.yml").getPath());
+  }
+}