ci(woodpecker): add labels and noninteractive env

- Bind pipeline to docker-labeled workers via top-level labels\n- Set DEBIAN_FRONTEND=noninteractive for sync/build steps\n- Keep existing build commands and flow unchanged

.woodpecker/ipq60xx.yml

@@ -9,6 +9,9 @@ variables:
   # Leave empty or set to 'main' to always use latest
   # UPSTREAM_GENERAL_REF: ""
 
+labels:
+  backend: docker
+
 steps:
   - name: init-env
     image: ubuntu:24.04
@@ -21,14 +24,17 @@ steps:
 
   - name: sync-configs
     image: ubuntu:24.04
+    environment:
+      DEBIAN_FRONTEND: noninteractive
+      UPSTREAM_GENERAL_REF: ${UPSTREAM_GENERAL_REF:-main}
     commands:
       - chmod +x ${CI_WORKSPACE}/Scripts/sync_upstream_config.sh
       - ${CI_WORKSPACE}/Scripts/sync_upstream_config.sh
-    environment:
-      UPSTREAM_GENERAL_REF: ${UPSTREAM_GENERAL_REF:-main}
 
   - name: build-ipq60xx-wifi-yes
     image: ubuntu:24.04
+    environment:
+      DEBIAN_FRONTEND: noninteractive
     commands:
       - git clone --depth=1 --single-branch --branch ${WRT_BRANCH} ${WRT_REPO} wrt-yes
       - cd wrt-yes
@@ -54,6 +60,8 @@ steps:
 
   - name: build-ipq60xx-wifi
     image: ubuntu:24.04
+    environment:
+      DEBIAN_FRONTEND: noninteractive
     commands:
       - git clone --depth=1 --single-branch --branch ${WRT_BRANCH} ${WRT_REPO} wrt-wifi
       - cd wrt-wifi