fix(ci): working directory for kustomize command

.forgejo/workflows/functions.yml

@@ -53,6 +53,7 @@ jobs:
           git add kustomization.yaml
           git commit -m "chore(deploy): update ${{ matrix.function }} image reference"
           git push || git pull --rebase && git push
+        working-directory: deploy
 
   deploy:
     runs-on: ubuntu-latest