Keep private sidecar profile data transient

crates/ely_app/src/services/servo_profile_data.rs

@@ -1,4 +1,8 @@
-use std::path::{Path, PathBuf};
+use std::{
+    env,
+    path::{Path, PathBuf},
+    time::{SystemTime, SystemTimeError, UNIX_EPOCH},
+};
 
 use directories::ProjectDirs;
 use ely_domain::ProfileId;
@@ -15,3 +19,20 @@ pub(super) fn default_profile_data_root() -> Option<PathBuf> {
 pub(super) fn profile_data_dir(profile_data_root: &Path, profile_id: &ProfileId) -> PathBuf {
     profile_data_root.join(profile_id.as_str()).join("servo")
 }
+
+pub(super) fn transient_profile_data_dir(
+    profile_id: &ProfileId,
+) -> Result<PathBuf, SystemTimeError> {
+    let timestamp = SystemTime::now().duration_since(UNIX_EPOCH)?.as_nanos();
+    Ok(env::temp_dir().join("ely-browser-servo-profiles").join(format!(
+        "{}-{}-{timestamp}",
+        std::process::id(),
+        profile_id.as_str()
+    )))
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub(crate) enum ProfileDataMode {
+    Persistent,
+    Transient,
+}