[Bug 1913986] Re: autoinstall layout for guided LUKS encryption

[Ryan Mounce]

I've implemented this & posted a PR:
https://github.com/canonical/subiquity/pull/1579

```
  storage:
    layout:
      name: lvm_use_all_space
      password: TEMPORARY
```

is equivalent to

```
d-i partman-auto/method string crypto
d-i partman-crypto/passphrase password TEMPORARY
d-i partman-crypto/passphrase-again password TEMPORARY
```

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https://bugs.launchpad.net/bugs/1913986

Title:
  autoinstall layout for guided LUKS encryption

Status in subiquity:
  Triaged

Bug description:
  Essentially we're looking for the guided LVM/LUKS option available via
  the subiquity GUI to be extended to autoinstall.

  Previously we could achieve this with d-i/preseed:
  ```
  d-i partman-auto/method string crypto
  d-i partman-crypto/passphrase password TEMPORARY
  d-i partman-crypto/passphrase-again password TEMPORARY
  ```

  So it would be nice to have something like:
  ```
    storage:
      layout:
        name: lvm
        options:
          encrypt: True
          luks_options:
            password: TEMPORARY
  ```

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