test new action post-if variant

Author: dmitry-shibanov

action.yml

@@ -33,4 +33,4 @@ runs:
   using: 'node12'
   main: 'dist/setup/index.js'
   post: 'dist/cleanup/index.js'
-  post-if: inputs.cache && inputs.cache.trim()
+  post-if: inputs.cache != ''