Pass timezone through to the VM

What a way to discover that this was missing- PipeWire camera was
freezing unless something on the host was already streaming it…

gstclock.c:1086:gst_clock_get_internal_time:<pipewireclock0> internal time 1:01:04.622699903
gstclock.c:1129:gst_clock_get_time:<pipewireclock0> adjusted time 5123776:20:12.866176008

Well, that wasn't even caused by the TZ but it made me think to fix it..

NOTE for local dev, rebuild micro-activate now

micro-activate.rs

@@ -71,6 +71,7 @@ fn main() -> Result<(), std::io::Error> {
     //
     // Let's preserve the fixed passed-in files and set up the NixOS symlinks in the new mount.
     let resolv_conf = std::fs::read("/run/resolv.conf")?;
+    let localtime = std::fs::read("/run/localtime")?;
     assert_eq!(
         unsafe {
             mount(
@@ -83,6 +84,7 @@ fn main() -> Result<(), std::io::Error> {
         },
         0
     );
+    std::fs::write("/run/localtime", &localtime)?;
     std::fs::write("/run/resolv.conf", &resolv_conf)?;
     std::fs::write("/run/machine-id", &gen_machine_id())?;
     std::os::unix::fs::symlink(&closure, "/run/current-system")?;