Switch from maven to gradle.

backend/codiki-infrastructure/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    id("io.spring.dependency-management") version "1.1.7"
+//    kotlin("plugin.jpa") version "2.1.20"
+}
+
+dependencies {
+//    implementation(kotlin("stdlib"))
+    implementation(project(":codiki-application"))
+    implementation(project(":codiki-domain"))
+    implementation("org.springframework:spring-context")
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("org.postgresql:postgresql:42.7.5")
+}