feat: attempts to implement continuous builds via Forgejo trigger

hosts/lab/wynne.nix

@@ -2,6 +2,7 @@
 let
   port = 4322;
   dataDir = "/srv/wynne";
+  repo = "https://git.ily.rs/lew/wynne";
 in
 {
   services.caddy.virtualHosts."wynne.rs" = {
@@ -19,7 +20,8 @@ in
 
   systemd.services.wynne = {
     description = "wynne.rs";
-    after = [ "network.target" ];
+    after = [ "wynne-rebuild.service" ];
+    wants = [ "wynne-rebuild.service" ];
     wantedBy = [ "multi-user.target" ];
     environment = {
       HOST = "127.0.0.1";
@@ -37,6 +39,67 @@ in
     };
   };
 
+  # Always rebuilds because wynne bakes DB content (guestbook) into pages at build time
+  systemd.services.wynne-rebuild = {
+    description = "Clone/pull and build wynne.rs";
+    after = [ "network-online.target" ];
+    wants = [ "network-online.target" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = false;
+      ExecStart = pkgs.writeShellScript "rebuild-wynne" ''
+        set -euo pipefail
+        if [ ! -d ${dataDir}/repo/.git ]; then
+          mkdir -p ${dataDir}
+          ${pkgs.git}/bin/git clone ${repo} ${dataDir}/repo
+        fi
+        mkdir -p ${dataDir}/data
+        cd ${dataDir}/repo
+        ${pkgs.git}/bin/git fetch origin
+        ${pkgs.git}/bin/git reset --hard origin/main
+        ${pkgs.pnpm}/bin/pnpm install --frozen-lockfile
+        ${pkgs.pnpm}/bin/pnpm build
+      '';
+      # + prefix runs this line as root (wynne user can't restart services)
+      ExecStartPost = "+/run/current-system/sw/bin/systemctl restart wynne";
+      User = "wynne";
+      Group = "wynne";
+      ReadWritePaths = [ dataDir ];
+    };
+  };
+
+  # Watches a trigger file, starts wynne-rebuild when touched
+  systemd.paths.wynne-rebuild-trigger = {
+    description = "Watch for wynne rebuild trigger";
+    wantedBy = [ "multi-user.target" ];
+    pathConfig = {
+      PathModified = "${dataDir}/trigger";
+      Unit = "wynne-rebuild.service";
+    };
+  };
+
+  systemd.services.wynne-webhook = {
+    description = "Webhook listener for wynne.rs";
+    after = [ "network.target" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = let
+        hooks = pkgs.writeText "wynne-hooks.json" (builtins.toJSON [{
+          id = "wynne-rebuild";
+          execute-command = "/run/current-system/sw/bin/touch";
+          pass-arguments-to-command = [
+            { source = "string"; name = "${dataDir}/trigger"; }
+          ];
+        }]);
+      in "${pkgs.webhook}/bin/webhook -hooks ${hooks} -port ${toString (port + 1)} -verbose";
+      Restart = "always";
+      User = "wynne";
+      Group = "wynne";
+    };
+  };
+
   users.users.wynne = {
     isSystemUser = true;
     group = "wynne";