arti-bench: Disable all fs permissions (fs-mistrust) checks

This is a benchmarking tool, and fs-mistrust doesn't like the
permissions in our CI.  The env var ARTI_FS_DISABLE_PERMISSION_CHECKS
is (of course) specific to arti.  Maybe it should be honoured here,
or this should be done via the config files.

But disabling this is fine for now.

Cargo.lock

@@ -113,6 +113,7 @@ dependencies = [
  "arti-config",
  "clap",
  "float-ord",
+ "fs-mistrust",
  "futures",
  "rand 0.8.5",
  "serde",

crates/arti-bench/Cargo.toml

@@ -26,4 +26,5 @@ tor-rtcompat = { path = "../tor-rtcompat", version = "0.3.0", features = ["tokio
 arti = { path = "../arti", version = "0.3.0"}
 arti-config = { path = "../arti-config", version = "0.3.0"}
 arti-client = { package = "arti-client", path = "../arti-client", version = "0.3.0"}
+fs-mistrust = { path = "../fs-mistrust", version = "0.1.0" }
 tokio-socks = "0.5"

crates/arti-bench/src/main.rs

@@ -359,6 +359,13 @@ fn main() -> Result<()> {
         .values_of_os("arti-config")
         .unwrap_or_default()
         .for_each(|f| config_sources.push_file(f));
+
+    // TODO really we ought to get this from the arti configuration, or something.
+    // But this is OK for now since we are a benchmarking tool.
+    let mut mistrust = fs_mistrust::Mistrust::new();
+    mistrust.dangerously_trust_everyone();
+    config_sources.set_mistrust(mistrust);
+
     let cfg = config_sources.load()?;
     let config: ArtiConfig = cfg.try_into()?;
     let tcc = config.tor_client_config()?;