feat: check if the returned runtime is indeed a valid node runtime

Author: lkeijmel

lib/plugins/aws/custom-resources/index.js

@@ -162,7 +162,11 @@ async function addCustomResourceToService(awsProvider, resourceName, iamRoleStat
     });
   }
 
-  const runtimeVersion = providerConfig.runtime ? providerConfig.runtime : 'nodejs18.x';
+  let runtimeVersion = 'nodejs18.x';
+  const providerRuntime = awsProvider.getRuntime();
+  if (providerRuntime.indexOf('nodejs') !== -1) {
+    runtimeVersion = providerRuntime;
+  }
 
   const customResourceFunction = {
     Type: 'AWS::Lambda::Function',