ci: unify fmt check (#3159)

## What ❔

prover ci should check formatting with zkstack_cli 

## Why ❔

<!-- Why are these changes done? What goal do they contribute to? What
are the principles behind them? -->
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iterators are in context about the evolution of repos. -->

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [ ] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [ ] Code has been formatted via `zkstack dev fmt` and `zkstack dev
lint`.

.github/workflows/ci-prover-reusable.yml

@@ -40,7 +40,9 @@ jobs:
           ci_run zkstack dev db setup --prover-url=${{ env.prover_url }} --core-url=${{ env.core_url }}
 
       - name: Formatting
-        run: ci_run bash -c "cd prover && cargo fmt --check"
+        run: |
+          ci_run git config --global --add safe.directory /usr/src/zksync
+          ci_run zkstack dev fmt --check rustfmt
 
   unit-tests:
     runs-on: [ matterlabs-ci-runner-highmem-long ]