Configure mainland build mirrors and persist BuildKit apt and pip caches

.github/workflows/verify.yml

@@ -3,6 +3,9 @@ on: [push, pull_request, workflow_dispatch]
 jobs:
   verify:
     runs-on: ubuntu-latest
+    env:
+      DEBIAN_MIRROR: ${{ vars.DEBIAN_MIRROR }}
+      DEBIAN_SECURITY_MIRROR: ${{ vars.DEBIAN_SECURITY_MIRROR }}
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -22,8 +25,8 @@ jobs:
           p=Path('.env')
           p.write_text(p.read_text().replace('FRAME_FLOW_TOKEN=\n', 'FRAME_FLOW_TOKEN='+secrets.token_urlsafe(32)+'\n'))
           PY
-          docker compose config --quiet
-          docker compose build --pull
+          . ./deploy/build-cn.env
+          ./scripts/build-verify.sh
           mkdir -p data/images data/generated data/cache config
           sudo chown -R 10333:10333 data config
           docker compose up -d