test: add TimescaleDB test base class and Flyway migration smoke test

cameleer3-server-app/src/test/java/com/cameleer3/server/app/AbstractPostgresIT.java

@@ -0,0 +1,29 @@
+package com.cameleer3.server.app;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+import org.testcontainers.containers.PostgreSQLContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@Testcontainers
+public abstract class AbstractPostgresIT {
+
+    @Container
+    static final PostgreSQLContainer<?> postgres =
+            new PostgreSQLContainer<>("timescale/timescaledb:latest-pg16")
+                    .withDatabaseName("cameleer3")
+                    .withUsername("cameleer")
+                    .withPassword("test");
+
+    @DynamicPropertySource
+    static void configureProperties(DynamicPropertyRegistry registry) {
+        registry.add("spring.datasource.url", postgres::getJdbcUrl);
+        registry.add("spring.datasource.username", postgres::getUsername);
+        registry.add("spring.datasource.password", postgres::getPassword);
+        registry.add("spring.datasource.driver-class-name", () -> "org.postgresql.Driver");
+        registry.add("spring.flyway.enabled", () -> "true");
+    }
+}