Log/error-out value of GITHUB_ACTIONS

Author: S0AndS0

tests/units/autoload_proompter_callback_prompt.vader

@@ -5,6 +5,7 @@ Execute (proompter#callback#prompt#EncodeImagesFromFilePaths -- Reads and encode
   let file_path = '/tmp/checkerboard.png'
 
   " TODO: Maybe also inspect `/etc/os-release`
+  echoe "system('echo $GITHUB_ACTIONS') ->" system('echo $GITHUB_ACTIONS')
   if system('echo $GITHUB_ACTIONS') == 'true'
     call system("convert -size 1x1 'xc:rgb(0,0,0)' " . file_path)
   else