Fix: Konfigurera git-identitet i export-workflow

Utan explicit git config user.email/name misslyckas commits i
klonat se-lex/sfs-repo med "Author identity unknown" beroende
på vilken runner-instans som används.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: marcarl

.github/workflows/git-export-workflow.yml

@@ -193,6 +193,11 @@ jobs:
         echo "branch_name=${BRANCH_NAME}" >> $GITHUB_OUTPUT
         echo "📋 Använder branch: ${BRANCH_NAME}"
 
+    - name: Configure Git identity
+      run: |
+        git config --global user.email "action@github.com"
+        git config --global user.name "GitHub Action"
+
     - name: Export to Git repository
       # Skippa om inga ändrade filer i "changed" mode
       if: steps.export_filter.outputs.filter_type != 'none' || steps.export_filter.outputs.changed_count != '0'