Use DOST-PAGASA + Cloudflare Time Service for the NTP servers

Alongside updating the enabled feature flags for Nix.

Signed-off-by: Andrei Jiroh Halili <[email protected]>

hosts/stellapent-cier/configuration.nix

@@ -9,6 +9,7 @@
     [
       ./hardware-configuration.nix
       ../../shared/meta-configs.nix
+      ../../shared/systemd.nix
       ../../shared/networking.nix
       ../../shared/locale.nix
       ../../shared/server/tailscale.nix

shared/meta-configs.nix

@@ -16,15 +16,20 @@
 
   nix = {
     settings = {
+      # See https://nix.dev/manual/nix/latest/development/experimental-features
+      # for latest supported feature flags.
       experimental-features = [
         "nix-command"
         "flakes"
-        "repl-flake"
         "ca-derivations"
         "cgroups"
         "impure-derivations"
-        #"daemon-trust-override"
-        #"auto-allocate-uids"
+        "git-hashing"
+        "fetch-tree"
+        "fetch-closure"
+        "local-overlay-store"
+        "mounted-ssh-store"
+        # "verified-fetches"
       ];
 
       trusted-users = [

shared/systemd.nix

@@ -0,0 +1,19 @@
+{ ... }:
+
+{
+  services.timesyncd = {
+    enable = true;
+    servers = [
+      # https://pubfiles.pagasa.dost.gov.ph/tamss/oras/time_synchronization_for_windows_7_and_8.pdf
+      "ntp.pagasa.dost.gov.ph"
+      # https://www.cloudflare.com/time/
+      "time.cloudflare.com"
+    ];
+    fallbackServers = [
+      "0.asia.pool.ntp.org"
+      "1.asia.pool.ntp.org"
+	    "2.asia.pool.ntp.org"
+	    "3.asia.pool.ntp.org"
+    ];
+  };
+}