Append user information to passwd (#396)

make_etc_passwd() is overwriting user information `passwd` from earlier hooks.

Signed-off-by: Gavin Scurr <gavin@scurr.me>
Closes #N/A
Issue #N/A

src/zfs-utils/zfs-utils.initcpio.zfsencryptssh.install

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 make_etc_passwd() {
-    echo 'root:x:0:0:root:/root:/bin/zfsdecrypt_shell' > "${BUILDROOT}"/etc/passwd
+    echo 'root:x:0:0:root:/root:/bin/zfsdecrypt_shell' >> "${BUILDROOT}"/etc/passwd
     echo '/bin/zfsdecrypt_shell' > "${BUILDROOT}"/etc/shells
 }