chore: add renovate

.gitlab/renovate.json5

@@ -0,0 +1,22 @@
+{
+  "extends": [
+    "config:recommended"
+  ],
+  "gitlabci": {
+    "enabled": false
+  },
+  "lockFileMaintenance": {
+    "enabled": true,
+    "extends": [
+      "schedule:monthly"
+    ]
+  },
+  "nix": {
+    "enabled": true
+  },
+  "postUpgradeTasks": {
+    "commands": [
+      "nix-portable nix run .#soonix:update"
+    ]
+  }
+}

nix/repo/soonix.nix

@@ -9,6 +9,26 @@ in
   (soonix.make {
     hooks = {
       ci = ci.soonix;
+      renovate = {
+        output = ".gitlab/renovate.json5";
+        data = {
+          extends = ["config:recommended"];
+          postUpgradeTasks.commands = [
+            "nix-portable nix run .#soonix:update"
+          ];
+          lockFileMaintenance = {
+            enabled = true;
+            extends = ["schedule:monthly"];
+          };
+          nix.enabled = true;
+          gitlabci.enabled = false;
+        };
+        hook = {
+          mode = "copy";
+          gitignore = false;
+        };
+        opts.format = "json";
+      };
       test = {
         output = "test.yaml";
         generator = "nix";