refactor: Reorganize GitHub Actions for better reusability (#5949)

## Summary

This PR refactors the GitHub Actions workflow structure to improve
reusability, maintainability, and CI performance.

## Changes

### New Actions
- **setup-comfyui-server**: New composite action that handles ComfyUI
server setup and launch
  - Checks out ComfyUI repository
  - Installs ComfyUI_devtools custom node
  - Sets up Python environment and dependencies
  - Optionally launches the server with configurable parameters

### Refactored Actions
- **setup-frontend**: Simplified to focus only on frontend-specific
tasks
  - Installs pnpm and Node.js
  - Installs dependencies
- Optionally builds the frontend (can be skipped when using cached
builds)
  - No longer handles server setup or checkout

### Workflow Improvements

#### tests-ci.yaml
- Introduced a setup job that builds once and caches the entire
workspace
- Test jobs now restore the cached workspace instead of rebuilding
- Eliminated redundant setup steps in each test shard
- Better separation between setup and test execution phases
- Significant performance improvement through workspace caching

#### Locale Update Workflows
- Updated `update-locales.yaml` to use the new action structure
- Updated `update-locales-for-given-custom-node-repository.yaml` with
proper custom node installation
- Updated `update-node-definitions-locales.yaml` to use new actions
- Removed `working-directory` references where appropriate

#### Other Workflows
- Updated `update-playwright-expectations.yaml` to use new action
structure
- Consistent action usage across all workflows

## Benefits

1. **Better Performance**: Workspace caching eliminates redundant builds
in CI, significantly reducing test execution time
2. **Improved Maintainability**: Clear separation of concerns makes
actions easier to understand and modify
3. **Enhanced Reusability**: Actions can be composed in different ways
for different workflows
4. **DRY Principle**: Eliminated code duplication across workflows
5. **Easier Debugging**: Smaller, focused actions make it easier to
identify and fix issues

## Testing

- [ ] Verify tests-ci workflow runs successfully
- [ ] Verify locale update workflows function correctly
- [ ] Verify playwright expectations update workflow works
- [ ] Confirm cache/restore mechanism works as expected

## Related Issues

This refactoring addresses workflow complexity and reduces CI runtime by
leveraging GitHub Actions caching more effectively.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5949-refactor-Reorganize-GitHub-Actions-for-better-reusability-2846d73d365081ae8e16f151423b5a88)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>
Co-authored-by: DrJKL <DrJKL0424@gmail.com>

.github/workflows/update-locales.yaml

@@ -16,36 +16,33 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v5
-    
-    - name: Setup Frontend
-      uses: ./.github/actions/setup-frontend
-    
-    - name: Cache tool outputs
-      uses: actions/cache@v4
+
+    # Setup playwright environment
+    - name: Setup ComfyUI Server
+      uses: ./.github/actions/setup-comfyui-server
       with:
-        path: |
-          ComfyUI_frontend/.cache
-          ComfyUI_frontend/.cache
-        key: i18n-tools-cache-${{ runner.os }}-${{ hashFiles('ComfyUI_frontend/pnpm-lock.yaml') }}
-        restore-keys: |
-          i18n-tools-cache-${{ runner.os }}-
+        launch_server: true
+    - name: Setup ComfyUI Frontend
+      uses: ./.github/actions/setup-frontend
+      with:
+        include_build_step: true
     - name: Setup Playwright
       uses: ./.github/actions/setup-playwright
+
     - name: Start dev server
       # Run electron dev server as it is a superset of the web dev server
       # We do want electron specific UIs to be translated.
       run: pnpm dev:electron &
-      working-directory: ComfyUI_frontend
+
+    # Update locales, collect new strings and update translations using OpenAI, then commit changes
     - name: Update en.json
       run: pnpm collect-i18n
       env:
         PLAYWRIGHT_TEST_URL: http://localhost:5173
-      working-directory: ComfyUI_frontend
     - name: Update translations
       run: pnpm locale
       env:
         OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
-      working-directory: ComfyUI_frontend
     - name: Commit updated locales
       run: |
         git config --global user.name 'github-actions'
@@ -59,4 +56,3 @@ jobs:
         git add src/locales/
         git diff --staged --quiet || git commit -m "Update locales [skip ci]"
         git push origin HEAD:${{ github.head_ref }}
-      working-directory: ComfyUI_frontend