♻️ refactor(workflow): enhance version extraction and workflow reliability

- add type hints to functions for better code clarity
- fix version extraction logic to correctly access version from dictionary
- improve error handling in workflow with better debugging information
- update workflow to use pull request head ref for accurate file detection
- add fallback to 'latest' version when extraction fails
- enhance logging with old and new version display
- rename script reference from .sh to .py in workflow step
- modify checkout action to use head ref instead of default

.github/workflows/renovate-app-version.yml

@@ -46,6 +46,7 @@ jobs:
         uses: actions/checkout@v5.0.0
         with:
           fetch-depth: 0
+          ref: ${{ github.head_ref }}
 
       - uses: actions/setup-python@main
         with:
@@ -60,9 +61,21 @@ jobs:
       - name: Get list of updated files by the last commit in this branch separated by space
         id: updated-files
         run: |
-          echo "files=$(git diff-tree --no-commit-id --name-only -r ${{ github.sha }} | tr '\n' ' ')" >> $GITHUB_OUTPUT
+          # 当触发工作流的事件为 pull_request 时，github.sha 值为 github.ref 分支上的最后一次合并提交
+          files=$(git diff-tree --no-commit-id --name-only -r ${{ github.event.pull_request.head.sha }} | tr '\n' ' ')
+          if [ -z "$files" ]; then
+            echo "❌ 错误：没有检测到文件变更"
+            echo "github.sha = ${{ github.sha }}"
+            echo "github.event.pull_request.head.sha = ${{ github.event.pull_request.head.sha }}"
+            echo "当前分支最新的提交SHA: $(git rev-parse HEAD)"
+            echo "💡 最近三次提交："
+            echo "   $(git log -3)"
+            exit 1
+          else
+            echo "files=$files" >> $GITHUB_OUTPUT
+          fi
 
-      - name: Run renovate-app-version.sh on updated files
+      - name: Run renovate-app-version.py on updated files
         run: |
           IFS=' ' read -ra files <<< "${{ steps.updated-files.outputs.files }}"