feat(hosts): add deploy-rs nodes and checks

modules/hosts/default.nix

@@ -1,4 +1,5 @@
 {
+  self,
   inputs,
   outputs,
   config,
@@ -66,17 +67,61 @@ let
         config.flake.modules.nixOnDroid.${hostName}
       ];
     };
-in
-{
-  flake.nixosConfigurations = builtins.mapAttrs mkHost {
-    alpha = { };
-    arcturus = { };
-    canopus = { };
-    sirius = { };
-    vps = { };
+
+  mkNixOSNode = hostname: {
+    inherit hostname;
+    profiles.system = {
+      user = "root";
+      path = inputs.deploy-rs.lib.x86_64-linux.activate.nixos self.nixosConfigurations.${hostname};
+    };
   };
 
-  flake.nixOnDroidConfigurations = builtins.mapAttrs mkDroidHost {
-    vega = { };
+  activateNixOnDroid =
+    configuration:
+    inputs.deploy-rs.lib.aarch64-linux.activate.custom configuration.activationPackage "${configuration.activationPackage}/activate";
+
+  mkDroidNode = hostname: {
+    inherit hostname;
+    profiles.system = {
+      sshUser = "nix-on-droid";
+      user = "nix-on-droid";
+      magicRollback = true;
+      sshOpts = [
+        "-p"
+        "8033"
+      ];
+      path = activateNixOnDroid self.nixOnDroidConfigurations.${hostname};
+    };
   };
+in
+{
+  flake = {
+    nixosConfigurations = builtins.mapAttrs mkHost {
+      sirius = { };
+      canopus = { };
+      arcturus = { };
+      alpha = { };
+      vps = { };
+    };
+
+    nixOnDroidConfigurations = builtins.mapAttrs mkDroidHost {
+      vega = { };
+    };
+
+    deploy.nodes = {
+      sirius = mkNixOSNode "sirius";
+      canopus = mkNixOSNode "canopus";
+      arcturus = mkNixOSNode "arcturus";
+      alpha = mkNixOSNode "alpha";
+      vega = mkDroidNode "vega";
+    };
+  };
+
+  perSystem =
+    { ... }:
+    {
+      checks = builtins.mapAttrs (
+        _: config: config.config.system.build.toplevel
+      ) self.nixosConfigurations;
+    };
 }