샘플코드 추가

api-app/infrastructure-db-postgres/build.gradle

@@ -3,6 +3,6 @@ plugins {
 }
 
 dependencies {
-    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
-    runtimeOnly 'org.postgresql:postgresql'
+    // DB 드라이버
+    implementation 'org.postgresql:postgresql:42.7.3'
 }