[v0.18.0][CI] Close build image by pr (#7776)

### What this PR does / why we need it?
Close build image by pr

This PR is related to
https://github.com/vllm-project/vllm-ascend/pull/7775, please merge them
together

Signed-off-by: hfadzxy <starmoon_zhang@163.com>

.github/workflows/schedule_image_build_and_push.yaml

@@ -11,36 +11,6 @@
 #   - Publish when tag with v* (pep440 version)  ===>  vllm-ascend:v1.2.3 / vllm-ascend:v1.2.3rc1
 name: Image Build and Push
 on:
-  push:
-    # Publish image when tagging, the Dockerfile in tag will be build as tag image
-    branches:
-      - 'releases/*'
-    tags:
-      - 'v*'
-    paths:
-      - '.github/workflows/schedule_image_build_and_push.yaml'
-      - 'Dockerfile*'
-      - 'vllm_ascend/**'
-      - 'setup.py'
-      - 'pyproject.toml'
-      - 'requirements.txt'
-      - 'cmake/**'
-      - 'CMakeLists.txt'
-      - 'csrc/**'
-  pull_request:
-    branches:
-      - 'releases/*'
-    paths:
-      - '.github/workflows/schedule_image_build_and_push.yaml'
-      - 'Dockerfile*'
-      - 'vllm_ascend/**'
-      - 'setup.py'
-      - 'pyproject.toml'
-      - 'requirements.txt'
-      - 'cmake/**'
-      - 'CMakeLists.txt'
-      - 'csrc/**'
-    types: [ labeled, synchronize ]
   workflow_dispatch:
     inputs:
       tag:
@@ -63,7 +33,6 @@ concurrency:
 jobs:
   image_build:
     name: Image Build and Push
-    if: ${{ github.event_name == 'push' || contains(github.event.pull_request.labels.*.name, 'image-build') }}
     strategy:
       matrix:
         build_meta:
@@ -90,7 +59,7 @@ jobs:
       dockerfile: ${{ matrix.build_meta.dockerfile }}
       suffix: ${{ matrix.build_meta.suffix }}
       quay_username: ${{ vars.QUAY_USERNAME }}
-      should_push: ${{ github.repository_owner == 'vllm-project' && github.event_name == 'push'}}
+      should_push: ${{ github.repository_owner == 'vllm-project'}}
       workflow_dispatch_tag: ${{ inputs.tag }}
     secrets:
       QUAY_PASSWORD: ${{ secrets.QUAY_PASSWORD }}