Modules: add deploy-rs config

modules/flake/default.nix

@@ -3,6 +3,7 @@
     ../../systems
 
     ./args.nix
+    ./deploy-rs.nix
     ./fmt.nix
     ./shell.nix
   ];

modules/flake/deploy-rs.nix

@@ -0,0 +1,43 @@
+{
+  lib,
+  self,
+  inputs,
+  config,
+  ...
+}: let
+  inherit (builtins) elem mapAttrs attrNames;
+  inherit (lib.attrsets) filterAttrs;
+
+  # extract the names of the systems that we want to deploy
+  deployableSystems = attrNames (filterAttrs (_: attrs: attrs.deployable) config.easy-hosts.hosts);
+
+  easyHostsFromDeployableSystems =
+    filterAttrs (
+      name: _: elem name deployableSystems
+    )
+    self.nixosConfigurations;
+in {
+  flake = {
+    checks = {
+      x86_64-linux = inputs.deploy-rs.lib.x86_64-linux.deployChecks self.deploy;
+      # aarch64-linux = inputs.deploy-rs.lib.aarch64-linux.deployChecks self.deploy;
+    };
+
+    deploy = {
+      autoRollback = true;
+      magicRollback = true;
+
+      # then create a list of nodes that we want to deploy that we can pass to the deploy configuration
+      nodes =
+        mapAttrs (name: node: {
+          hostname = name;
+          profiles.system = {
+            user = "root";
+            sshUser = node.config.olympus.system.mainUser or "root";
+            path = inputs.deploy-rs.lib.${config.easy-hosts.hosts.${name}.system}.activate.nixos node;
+          };
+        })
+        easyHostsFromDeployableSystems;
+    };
+  };
+}