fix(ci): skip build-windows until windows-runner is registered

timeout-minutes doesn't start until a runner accepts the job, so the
job would queue indefinitely. Disable with if: false for now — change
back to github.ref == 'refs/heads/main' once a windows-runner runner
is set up.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.forgejo/workflows/ci.yml

@@ -60,12 +60,12 @@ jobs:
         run: nix develop --no-warn-dirty --command task deploy-linux-to-server
 
   build-windows:
+    # Enable once a self-hosted runner with label "windows-runner" is registered.
     name: Build & Deploy Windows Release
     runs-on: windows-runner
     needs: check
-    if: github.ref == 'refs/heads/main'
+    if: false
     continue-on-error: true
-    timeout-minutes: 5
 
     steps:
       - uses: actions/checkout@v4