Try to build for musl libc

flake.nix

@@ -115,6 +115,11 @@
       };
 
       defaults = { name, config, ... }: {
+        nixpkgs = {
+          buildPlatform = self.lib.platforms.x86_64-linux;
+          hostPlatform = self.lib.platforms.x86_64-linux;
+        };
+
         deployment = {
           allowLocalDeployment = true;
           targetHost = config.networking.fqdnOrHostName;

lib/platforms.nix

@@ -4,13 +4,16 @@ let inherit (nixpkgs) lib;
 in lib.mapAttrs (system: platform: lib.systems.elaborate platform) {
   "x86_64-linux" = {
     system = "x86_64-linux";
+    config = "x86_64-unknown-linux-musl";
   };
 
   "aarch64-linux" = {
     system = "aarch64-linux";
+    config = "aarch64-unknown-linux-musl";
   };
 
   "riscv64-linux" = {
     system = "riscv64-linux";
+    config = "riscv64-unknown-linux-musl";
   };
 }