feat: add thisServer method in ServerApi

Author: niklasnieberler

controller-api/src/main/kotlin/app/simplecloud/controller/api/ServerApi.kt

@@ -17,6 +17,13 @@ interface ServerApi {
          */
         fun getAllServers(): CompletableFuture<List<Server>>
 
+        /**
+         * @return a [CompletableFuture] with the [Server] from the SIMPLECLOUD_UNIQUE_ID environment
+         */
+        fun thisServer(): CompletableFuture<Server> {
+            return getServerById(System.getenv("SIMPLECLOUD_UNIQUE_ID"))
+        }
+
         /**
          * @param id the id of the server.
          * @return a [CompletableFuture] with the [Server].
@@ -124,6 +131,13 @@ interface ServerApi {
          */
         suspend fun getAllServers(): List<Server>
 
+        /**
+         * @return the [Server] from the SIMPLECLOUD_UNIQUE_ID environment
+         */
+        suspend fun thisServer(): Server {
+            return getServerById(System.getenv("SIMPLECLOUD_UNIQUE_ID"))
+        }
+
         /**
          * @param id the id of the server.
          * @return the [Server].