you can protect HEREDOC to avoid using base64

Hello,

Thanks for your great work to help using ZFS on Rocky Linux. 
On lines 429 and 469 of install-root-on-zfs-rocky.sh you are using HEREDOC with base64 encoded content. 
You could avoid that by enclosing EOF1 and EOF2 with single quotes: 

```
tee /tmp/foo <<'EOF1'
  blahblah
EOF1
```
That would probably make the script easier to maintain.