Speedup image build

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

Author: Yikun

.github/workflows/image_openeuler.yml

@@ -34,8 +34,12 @@ on:
 jobs:
   build:
     name: vllm-ascend openEuler image
-    runs-on: ubuntu-latest
-
+    runs-on: >-
+      ${{
+          github.event_name == 'push' && github.repository_owner == 'vllm-project' &&
+          'ubuntu-latest' ||
+          'ubuntu-24.04-arm'
+      }}
     steps:
     - uses: actions/checkout@v4
 
@@ -87,7 +91,12 @@ jobs:
     - name: Build and push
       uses: docker/build-push-action@v6
       with:
-        platforms: linux/amd64,linux/arm64
+        platforms: >-
+          ${{
+              github.event_name == 'push' && github.repository_owner == 'vllm-project' &&
+              'linux/amd64,linux/arm64' ||
+              'linux/arm64'
+          }}
         # use the current repo path as the build context, ensure .git is contained
         context: .
         # only trigger when tag, branch/main push

.github/workflows/image_ubuntu.yml

@@ -87,7 +87,12 @@ jobs:
     - name: Build and push
       uses: docker/build-push-action@v6
       with:
-        platforms: linux/amd64,linux/arm64
+        platforms: >-
+          ${{
+              github.event_name == 'push' && github.repository_owner == 'vllm-project' &&
+              'linux/amd64,linux/arm64' ||
+              'linux/amd64'
+          }}
         # use the current repo path as the build context, ensure .git is contained
         context: .
         # only trigger when tag, branch/main push