feat(tvix/castore/fs): support extended attributes r/7912

This exposes `user.tvix.castore.{blob,directory}.digest` xattr keys for
files and directories:

```
❯ getfattr -d /tmp/tvix/06jrrv6wwp0nc1m7fr5bgdw012rfzfx2-nano-7.2-info
getfattr: Removing leading '/' from absolute path names
user.tvix.castore.directory.digest="b3:SuYDcUM9RpWcnA40tYB1BtYpR0xw72v3ymhKDQbBfe4="

❯ getfattr -d /tmp/tvix/156a89x10c3kaby9rgf3fi4k0p6r9wl1-etc-shells
getfattr: Removing leading '/' from absolute path names
user.tvix.castore.blob.digest="b3:pZkwZoHN+/VQ8wkaX0wYVXZ0tV/HhtKlSqiaWDK7uRs="
```

It's currently mostly used for debugging, though it might be useful for
tvix-castore-aware syncing programs using the filesystem too.

Change-Id: I26ac3cb9fe51ffbf7f880519f26741549cb5ab6a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11422
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Reviewed-by: Brian Olsen <me@griff.name>

1 files changed, 4 insertions, 0 deletions

diff --git a/tvix/Cargo.nix b/tvix/Cargo.nix
index 6886685b63..48b53a1943 100644
--- a/tvix/Cargo.nix
+++ b/tvix/Cargo.nix
@@ -13953,6 +13953,10 @@ rec {
             name = "tokio-retry";
             packageId = "tokio-retry";
           }
+          {
+            name = "xattr";
+            packageId = "xattr";
+          }
         ];
         features = {
           "cloud" = [ "dep:bigtable_rs" "object_store/aws" "object_store/azure" "object_store/gcp" ];