give the authelia-bridge store tests a unique temp dir each

swarm-authelia-bridge/src/store.rs

@@ -793,14 +793,13 @@ some_future_top_level_key: 7
     /// one test's lifetime, not durable state (see `state-not-tmp`: this
     /// is exactly the legitimate use, not a place we persist anything).
     fn tempdir() -> std::path::PathBuf {
+        static NEXT: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
         let dir = std::env::temp_dir().join(format!(
             "swarm-authelia-bridge-test-{}-{}",
             std::process::id(),
-            std::time::SystemTime::now()
-                .duration_since(std::time::UNIX_EPOCH)
-                .unwrap()
-                .as_nanos()
+            NEXT.fetch_add(1, std::sync::atomic::Ordering::Relaxed)
         ));
+        fs::remove_dir_all(&dir).ok();
         fs::create_dir_all(&dir).unwrap();
         dir
     }