install to-filesystem overwrites SSH host keys and SSH user keys and password

[stefwalter]

When I do a bootc switch or bootc update```` my SSH host keys and SSH user keys and password are preserved. But when I used bootc install to-filesystem``` they are lost.

When I connect to the same IP address after install to-filesystem SSH complains about the host keys having changed. In addition, the contents of /home, the SSH username, password have all been lost.

This behavior seems unexpectedly different, and surprising to me. Why does bootc switch keep the contents of /etc (and somehow merge it) and bootc install discards it? Ditto for other directories.