Add openEuler based container image for vLLM Ascend (#489)

### What this PR does / why we need it?

Provide users with openEuler-based vllm images, so modify the quick
start readme

### Does this PR introduce _any_ user-facing change?

None

### How was this patch tested?

There is no need for performing any test.

---------

Signed-off-by: Icey <1790571317@qq.com>

.github/workflows/image_openeuler.yml

@@ -0,0 +1,100 @@
+name: 'image'
+# This is a docker build check and publish job:
+# 1. PR Triggered docker image build check
+#   - is for image build check
+#   - Enable on main/*-dev branch
+#   - push: ${{ github.event_name != 'pull_request' }} ==> false
+# 2. branches push trigger image publish
+#   - is for branch/dev/nightly image
+#   - commits are merge into main/*-dev  ==> vllm-ascend:main / vllm-ascend:*-dev
+# 3. tags push trigger image publish
+#   - is for final release image
+#   - Publish when tag with v* (pep440 version)  ===>  vllm-ascend:v1.2.3-openeuler|latest / vllm-ascend:v1.2.3rc1-openeuler
+on:
+  pull_request:
+    branches:
+      - 'main'
+      - '*-dev'
+    paths:
+      - '.github/workflows/image_openeuler.yml'
+      - 'Dockerfile.openEuler'
+      - 'vllm_ascend/**'
+  push:
+    # Publish image when tagging, the Dockerfile in tag will be build as tag image
+    branches:
+      - 'main'
+      - '*-dev'
+    tags:
+      - 'v*'
+    paths:
+      - '.github/workflows/image_openeuler.yml'
+      - 'Dockerfile.openEuler'
+      - 'vllm_ascend/**'
+
+jobs:
+  build:
+    name: vllm-ascend openEuler image
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Print
+      run: |
+        lscpu
+
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        # TODO(yikun): add more hub image and a note on release policy for container image
+        images: |
+          quay.io/ascend/vllm-ascend
+        # Note for test case
+        # https://github.com/marketplace/actions/docker-metadata-action#typeref
+        # 1. branch job pulish per main/*-dev branch commits
+        # 2. main and dev pull_request is build only, so the tag pr-N-openeuler is fine
+        # 3. only pep440 matched tag will be published:
+        #    - v0.7.1 --> v0.7.1-openeuler, latest
+        #    - pre/post/dev: v0.7.1rc1-openeuler/v0.7.1rc1-openeuler/v0.7.1rc1.dev1-openeuler/v0.7.1.post1-openeuler, no latest
+        #      which follow the rule from vLLM with prefix v
+        # TODO(yikun): the post release might be considered as latest release
+        tags: |
+          type=ref,event=branch,suffix=-openeuler
+          type=ref,event=pr,suffix=-openeuler
+          type=pep440,pattern={{raw}}-openeuler
+
+    - name: Free up disk space
+      uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # v1.3.1
+      with:
+        tool-cache: true
+        docker-images: false
+
+    - name: Build - Set up QEMU
+      uses: docker/setup-qemu-action@v3
+      # TODO(yikun): remove this after https://github.com/docker/setup-qemu-action/issues/198 resolved
+      with:
+        image: tonistiigi/binfmt:qemu-v7.0.0-28
+
+    - name: Build - Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Publish - Login to Quay Container Registry
+      if: ${{ github.event_name == 'push' && github.repository_owner == 'vllm-project' }}
+      uses: docker/login-action@v3
+      with:
+        registry: quay.io
+        username: ${{ vars.QUAY_USERNAME }}
+        password: ${{ secrets.QUAY_PASSWORD }}
+
+    - name: Build and push
+      uses: docker/build-push-action@v6
+      with:
+        platforms: linux/amd64,linux/arm64
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
+        # only trigger when tag, branch/main push
+        push: ${{ github.event_name == 'push' && github.repository_owner == 'vllm-project' }}
+        labels: ${{ steps.meta.outputs.labels }}
+        tags: ${{ steps.meta.outputs.tags }}
+        file: Dockerfile.openEuler