chore: ensure exported platform setup have the correct type

Easier to work with the type system, allows to see what are the available methods once you choose a platform.

Author: ivanstanev

test/setup/platforms/index.ts

@@ -69,4 +69,6 @@ export default {
   eks: eksSetup,
   openshift3: openshift3Setup,
   openshift4: openshift4Setup,
+} as {
+  [key: string]: IPlatformSetup;
 };