[Platform] Add support for Altlas A3 series (#1794)

### What this PR does / why we need it?
Add support for Ascend A3 and remove latest tag

### Does this PR introduce _any_ user-facing change?
User can run vLLM on Altlas A3 series

### How was this patch tested?
CI passed with:

- remove latest tag test:
https://github.com/wxsIcey/wxs-vllm-ascend/actions/runs/16267635040/job/45926924765
- E2E image build for A3
- CI test on A3 with e2e test and longterm test
- Unit test missing because need a real A3 hardware to have a test

Closes: https://github.com/vllm-project/vllm-ascend/issues/1696


- vLLM version: v0.9.2
- vLLM main:
d0dc4cfca4

---------

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

.github/workflows/image_openeuler.yml

@@ -6,10 +6,9 @@ name: 'image / openEuler'
 #   - 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
+#   - commits are merge into main/*-dev  ==> vllm-ascend:main-openeuler / vllm-ascend:*-dev-openeuler
 #   - 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
+#   - Publish when tag with v* (pep440 version)  ===>  vllm-ascend:v1.2.3-openeuler / vllm-ascend:v1.2.3rc1-openeuler
 on:
   pull_request:
     branches:
@@ -65,7 +64,7 @@ jobs:
         # 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
+        #    - v0.7.1 --> v0.7.1-openeuler
         #    - 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
@@ -73,6 +72,8 @@ jobs:
           type=ref,event=branch,suffix=-openeuler
           type=ref,event=pr,suffix=-openeuler
           type=pep440,pattern={{raw}},suffix=-openeuler
+        flavor:
+          latest=true
 
     - name: Free up disk space
       uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # v1.3.1
@@ -112,3 +113,4 @@ jobs:
         file: Dockerfile.openEuler
         build-args: |
           PIP_INDEX_URL=https://pypi.org/simple
+        provenance: false