fix(tvix/nar-bridge): fix root node decoding and validation r/8382

This got broken while moving things around. We need to parse the
b64-decoded bytes.

Since we're now validating the root node, we also need to rename the
root node to get past the node name validation.

There probably should be some tests for this.

Co-Authored-By: sinavir@sinavir.fr
Change-Id: I8f24a4a0ac107b1ea5b94c0e0ed872a34eb7b587
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11996
Reviewed-by: Brian Olsen <me@griff.name>
Tested-by: BuildkiteCI

0 files changed, 0 insertions, 0 deletions