переименован конфиг и сделан пример

src/main/resources/application-sample.yaml

@@ -0,0 +1,14 @@
+ktor:
+  deployment:
+    host: "localhost"
+    port: 8080
+  application:
+    modules:
+      - su.redume.ApplicationKt.module
+  database:
+    jdbcURL: "jdbc:postgresql://localhost:5432"
+    database: "DATABASE_NAME"
+    user: "DATABASE_USER"
+    password: "DATABASE_PASSWORD"
+    maxPoolSize: 50
+    autoCommit: false

src/main/resources/application.yaml

@@ -1,10 +0,0 @@
-ktor:
-  port: 3000
-  host: localhost
-database:
-  jdbcURL: "jdbc:postgresql://localhost:5432"
-  database: "DATABASE_NAME"
-  user: "DATABASE_USER"
-  password: "DATABASE_PASSWORD"
-  maxPoolSize: 50
-  autoCommit: false