Fail upload task if it can't find files to upload and fix for Windows

If we can't find files to upload, then the task should fail, especially
in GitHub Actions. This also fixes pathing on Windows in a way that
should work for both local and CI Cygwin-based builds.

Author: nmburgan

tasks/upload.rake

@@ -16,12 +16,12 @@ namespace :vox do
     # Ensure the AWS CLI isn't going to fail with the given parameters
     run_command("#{s3} ls s3://#{bucket}/")
 
-    prepend = File.directory?('/cygdrive/') ? 'C:/cygwin64/' : ''
-    files = Dir.glob("#{prepend}#{__dir__}/../output/*#{munged_tag}*#{platform}*")
-    puts 'No files for the given tag found in the output directory.' if files.empty?
+    files = Dir.glob("#{__dir__}/../output/*#{munged_tag}*#{platform}*")
+    abort 'No files for the given tag found in the output directory.' if files.empty?
 
     path = "s3://#{bucket}/#{repo}/#{args[:tag]}"
     files.each do |f|
+      f = `cygpath -m #{f}`.chomp if platform =~ /windows-/
       run_command("#{s3} cp #{f} #{path}/#{File.basename(f)}", silent: false)
     end
   end