remove useless action

.github/workflows/pre-dev.yml

@@ -1,29 +0,0 @@
-name: Attu dev release
-
-on:
-  push:
-    branches: [dev]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Setup Node.js
-        uses: actions/setup-node@v1
-        with:
-          node-version: 14
-
-      - name: Login to DockerHub
-        uses: docker/login-action@v1
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PWD }}
-
-      - name: Docker Build
-        run: docker build -t zilliz/attu:dev --build-arg VERSION=dev .
-
-      - name: Docker Push Dev
-        run: docker push zilliz/attu:dev
-
-