James' Boot-And-Nuke, a module for dracut which uses hdparm and wipe to erase HDD and SSD devices.
The main caveat is that your SSD must be plugged into something that will accept or pass-through the SATA secure-erase commands---your typical hardware RAID card only presents the logical devices, so these commands won't work.
Breaking any arrays and putting the controller into JBOD mode may allow these commands to work, but I haven't tested it, and that functionality is beyond the current scope of this module.