fix: regenerate bun.nix in CI to prevent stale dependency errors

The Nix build has been failing since v3.9.6 because bun.nix fell out
of sync with bun.lock. During the sandboxed build bun install cannot
fetch missing packages, causing ConnectionRefused errors.

- Add bun2nix regeneration step before nix build in CI
- Trigger workflow on bun.lock and package.json changes
- Update flake.nix version from 3.9.6 to 3.14.1

.github/workflows/nix-build.yml

@@ -9,6 +9,8 @@ on:
       - 'flake.nix'
       - 'flake.lock'
       - 'bun.nix'
+      - 'bun.lock'
+      - 'package.json'
       - '.github/workflows/nix-build.yml'
   pull_request:
     branches: [main]
@@ -16,6 +18,8 @@ on:
       - 'flake.nix'
       - 'flake.lock'
       - 'bun.nix'
+      - 'bun.lock'
+      - 'package.json'
       - '.github/workflows/nix-build.yml'
 
 permissions:
@@ -39,6 +43,9 @@ jobs:
       - name: Setup Nix Cache
         uses: DeterminateSystems/magic-nix-cache-action@main
 
+      - name: Regenerate bun.nix from bun.lock
+        run: nix run github:nix-community/bun2nix -- -o bun.nix --accept-flake-config
+
       - name: Check flake
         run: nix flake check --accept-flake-config
 

flake.nix

@@ -31,7 +31,7 @@
         # Build the application
         gitea-mirror = pkgs.stdenv.mkDerivation {
           pname = "gitea-mirror";
-          version = "3.9.6";
+          version = "3.14.1";
 
           src = ./.;