I recently tried to update Alire to gnat internal 13. The command failed, due to disk full (I'm running in a virtual machine with a fairly small disk). So I manually deleted a bunch of stuff, including ~/.config/Alire/cache/dependencies/gnat-12*; then selecting gnat internal 13 worked.
There should be a way to delete old versions of the toolchain with an Alire command; perhaps
"alr toolchain --purge" to delete all not currently selected
"alr toolchain --delete " to delete a specific version.
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