NTS: Use `shred` on tmpramfs/user.key if the system has it.

[noahbliss]

Note to self to investigate using the shred command if the system has it when we are performing the step 3 stage. Practical risk of not using shred should be negligible, we're already using a ramdisk, but if we have it, why not. :shrug:

[noahbliss]

If someone wants to start working on this, we should probably write a function for both 3- scrips that:

1. is invoked by trap if the user cancels the script. Otherwise is just called at the end of the script.
2. uses command -v to see if the system has shred
3. uses shred on tmpramfs/user.key, and uses rm if shred is not on the system.
4. Takes care of the rest of the process for collapsing the tmpfs.

[Surowa]

Have you already done some work on this?
I might be able to help, if need be.

[noahbliss]

@Surowa if you want to give it a shot, go for it. Thanks!