More space needed for my PPA KDE Photo Applications for GTK Ubuntu

I am trying to build kphotoalbum for GTK Ubuntu on the latest 3 platforms : Trusty, Utopic and Vivid, in my PPA

https://launchpad.net/~anton+/+archive/ubuntu/kde-photo-apps

I need to build for this goal digikam which I succeed today, however when trying to upload some dependencies for kphotoalbum I got this message from launchpad :

PPA exceeded its size limit (2097.00 of 2048.00 MiB)

Keeping in mid that I didn't try to upload kphotoalbum yet ...
This is quite unnerving, as yesterday when some build failed I had to delete the entire digikam packages for all platforms.

I have the impression that all builds from earlier versions (of the packages) are kept and actually use the allocated 2 GiB. Then at anytime the size of the archive can grow without notice. Yesterday I had to delete all the packages for digikam, wait a full one day for the space to be re-allocated and build it again today.

In order to proceed I will need I think 2 GiB in additional space. As well I would like that previous versions builds be deleted for good from this space.

[Side Note]: I've seen that yesterday Ubuntu did build digikam for vivid, however to me it's not usable, as the dev packages are not build.