refactoring to more granular flakes and modules

flakes/common/nix_modules/remote_lio_builds.nix

@@ -0,0 +1,35 @@
+{
+  config,
+  ...
+}:
+{
+  # Remote build off home lio computer
+  programs.ssh.extraConfig = ''
+    Host lio_
+      PubkeyAcceptedKeyTypes ssh-ed25519
+      ServerAliveInterval 60
+      IPQoS throughput
+      IdentityFile ${config.age.secrets.nix2lio.path}
+  '';
+  nix = {
+    distributedBuilds = true;
+    buildMachines = [
+      {
+        # TODO require hostname in ssh config?
+        hostName = "lio_";
+        system = "x86_64-linux";
+        protocol = "ssh-ng";
+        maxJobs = 32;
+        speedFactor = 2;
+        supportedFeatures = [
+          "nixos-test"
+          "benchmark"
+          "big-parallel"
+          "kvm"
+          "uid-range" # Often helpful
+        ];
+        mandatoryFeatures = [ ];
+      }
+    ];
+  };
+}