add cache.ztier.in substituter, use hydra.int.chir.rs on vf2

config/nas.nix

@@ -121,6 +121,7 @@
     "https://attic.chir.rs/chir-rs/"
     "https://cache.nixos.org/"
     "https://beam.attic.rs/riscv"
+    "https://cache.ztier.in"
   ];
   nix.daemonCPUSchedPolicy = "idle";
   nix.daemonIOSchedClass = "idle";

config/nix.nix

@@ -45,6 +45,7 @@ in {
         "hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs="
         "chir-rs:AnwyFacopHSkprD6aXY4/R3J9JYzTbV2rosJCBPaB28="
         "riscv:TZX1ReuoIGt7QiSQups+92ym8nKJUSV0O2NkS4HAqH8="
+        "cache.ztier.link-1:3P5j2ZB9dNgFFFVkCQWT3mh0E+S3rIWtZvoql64UaXM="
       ];
       post-build-hook = "${post-build-hook}";
       auto-optimise-store = true;

config/vf2.nix

@@ -22,7 +22,11 @@
     (import ../overlays/riscv.nix)
   ];
 
-  nix.settings.substituters = ["https://beam.attic.rs/riscv"];
+  nix.settings.substituters = lib.mkForce [
+    "https://beam.attic.rs/riscv"
+    "https://cache.ztier.in"
+    "https://hydra.int.chir.rs"
+  ];
   boot = {
     supportedFilesystems = lib.mkForce ["vfat" "ext4" "nfs"];
     kernelPackages = pkgs.linuxPackagesFor (pkgs.vf2Kernel.override {