ci: only run build workflows on pull_request

[deepin-wm]

背景

构建类 GitHub Actions 工作流原本在 push 和 pull_request 两个事件下都会运行，主干每次推送都会触发一轮完整构建。按需求，构建类 workflow 只需在 pull_request 下运行，push 触发移除。

改动内容

删除以下构建类 workflow 的 push 触发，仅保留 pull_request：

• .github/workflows/ddm-archlinux-build.yml
• .github/workflows/ddm-deepin-build.yml

on: 块只删不加，未新增或改写任何其它触发键。

为什么这么改

构建 workflow 里没有依赖 push 事件的分支逻辑，移除触发不会让任何步骤失效；这些 workflow 也只通过 actions/upload-artifact@v4 上传产物，不做 release/部署/推包，因此对对外产物无影响。

刻意未改动的部分

.github/workflows/backup-to-gitlab.yml 保留 push：它是镜像/备份流程，不属于构建类。cppcheck.yml、call-* 系列本就为 pull_request_target / issue_comment 触发，不含 push。

关联

• Multica Issue: WM-565

Summary by Sourcery

CI:

• Run the Arch Linux and Deepin build workflows only for pull requests instead of push events.

[deepin-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR eliminates redundant builds on branch pushes by changing the Arch Linux and Deepin DDM build workflows to run only for pull requests, without modifying workflow jobs or other CI triggers.

File-Level Changes

Change	Details	Files
Restrict the two DDM build workflows to pull request events by removing their push triggers.	Remove the empty push event configuration. Preserve the existing pull_request trigger and all workflow jobs unchanged.	.github/workflows/ddm-archlinux-build.yml .github/workflows/ddm-deepin-build.yml

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: deepin-wm

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[deepin-bot]

TAG Bot

New tag: 0.4.0
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #115