ci: route CI/bots to mac runner; keep deploy on NAS

.gitea/workflows/ci.yaml

@@ -3,7 +3,7 @@ name: CI
 on:
   push:
   pull_request:
-    branches: [master]
+    branches: [main]
   workflow_dispatch:
 
 env:
@@ -15,8 +15,7 @@ defaults:
 
 jobs:
   build-and-anchors:
-    runs-on: ubuntu-latest
-    container:
+    runs-on: mac-ci    container:
       image: mcr.microsoft.com/devcontainers/javascript-node:22-bookworm
 
     steps: