Add configurable worker credentials for git operations

- Replace hardcoded git user email and name with configurable variables
- Add WORKER_EMAIL and WORKER_USERNAME variables for git commits and authentication
- Update workflow to use vars.WORKER_EMAIL and vars.WORKER_USERNAME
- Use WORKER_USERNAME in push URL authentication instead of hardcoded 'ci-bot'
- Update GITEA-ACTIONS-SETUP.md with instructions for setting up repository variables
- Add variables to setup checklist for complete configuration
- Provide flexibility for different organizations and naming conventions

GITEA-ACTIONS-SETUP.md

@@ -27,7 +27,19 @@ Ensure your Gitea instance has Actions enabled:
    - Value: Paste the token from step 2
    - Click "Add Secret"
 
-### 4. Enable Repository Actions
+### 4. Add Repository Variables
+1. **Go to Repository Settings**:
+   - Navigate to your repository → Settings → Variables
+2. **Add Worker Email Variable**:
+   - Name: `WORKER_EMAIL`
+   - Value: Email for git commits (e.g., `ci-bot@your-domain.com`)
+   - Click "Add Variable"
+3. **Add Worker Username Variable**:
+   - Name: `WORKER_USERNAME`
+   - Value: Username for git commits (e.g., `CI Auto-Sort Bot`)
+   - Click "Add Variable"
+
+### 5. Enable Repository Actions
 1. **Repository Settings**: Go to Settings → Actions
 2. **Enable Actions**: Check "Enable Actions"
 3. **Allow all actions**: Select appropriate action permissions
@@ -209,6 +221,8 @@ When reporting issues, include:
 - [ ] Gitea Actions enabled on instance
 - [ ] CI bot token created with `repo` scope
 - [ ] `CI_BOT_TOKEN` secret added to repository
+- [ ] `WORKER_EMAIL` variable added to repository
+- [ ] `WORKER_USERNAME` variable added to repository
 - [ ] Repository Actions enabled
 - [ ] Test files created and pushed
 - [ ] Workflow executed successfully