Can you expand on what you mean by "corrupted"?
What behaviour are you seeing?
Does it fail to install, or does it fail to run?
It won't run and it even doesn't have an icon. Normally the ipk has 2.9MB. Now it has only 2.74MB
When I try to upload the zip file via REST API then I get the error "no index.html present". But the zip contains this file in the root.
It seems like its actually your zip file that is corrupted -- at least Build doesn't seem to like it. The file tree retrieved from your zip looks like this:
So it seems to be reading your directory entries as files. How are you zipping?
I'm zipping either by gulp-zip or 7zip. Both running on Windows 7 machine. If I decompress the file then the directory structure is preserved. Even the 7zip identifies directory entries correctly.
I tried to upload the same www.zip archive into another account (APP ID 1641066) and it worked. So it makes me think that the problem may be at PhoneGap Build server.