[ci][fix] Falling back to explicit package build, test & publish rather than using the reusable workflow

.github/workflows/python-client.yml

@@ -24,9 +24,9 @@ jobs:
     steps:
       - name: Clone
         uses: actions/checkout@v3
-      - run: pip install flake8
+      - run: pip install flake8 flake8-pyproject
       - name: Flake8 lint Python code
-        run: (cd client && find src/ -type f -name '*.py' -exec flake8 --max-line-length=120 '{}' '+')
+        run: (cd client && flake8 src/)
 
   mypy:
     name: Type checking
@@ -38,14 +38,43 @@ jobs:
       - name: Mypy type checking
         run: (cd client && mypy src/)
 
-  packaging:
+  package_and_deploy:
+    name: Build and deploy Ethereum Client Python package
+    runs-on: ubuntu-latest
     needs: [lint, mypy]
-    name: Build, test and deploy the Python package
-    uses: LedgerHQ/ledger-app-workflows/.github/workflows/reusable_pypi_deployment.yml@v1
-    with:
-      package_directory: "client/"
-      stable_deployment: true
-      check_changelog_version: ${{ startsWith(github.ref,'refs/tags/') }}
-      publish: ${{ github.event_name == 'push' }}
-    secrets:
-      pypi_token: secrets.PYPI_PUBLIC_API_TOKEN
+    steps:
+
+    - name: Clone
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+
+    - name: Build Python package
+      run: |
+        pip install --upgrade pip build twine
+        cd client/
+        python -m build;
+        python -m twine check dist/*
+        pip install .;
+        echo "TAG_VERSION=$(python -c 'from ledger_app_clients.ethereum import __version__; print(__version__)')" >> "$GITHUB_ENV"
+
+    - name: Check version against CHANGELOG
+      if: startsWith(github.ref, 'refs/tags/')
+      run: |
+        CHANGELOG_VERSION=$(grep -Po '(?<=## \[)(\d+\.)+[^\]]' client/CHANGELOG.md | head -n 1)
+        if [ "${{ env.TAG_VERSION }}" == "${CHANGELOG_VERSION}" ];
+        then
+            echo 'Package and CHANGELOG versions match!';
+            exit 0;
+        else
+            echo "Tag '${{ env.TAG_VERSION }}' and CHANGELOG '${CHANGELOG_VERSION}' versions mismatch!";
+            exit 1;
+        fi
+
+    - name: Publish Python package on pypi.org
+      if: success() && github.event_name == 'push'
+      run: (cd client && python -m twine upload --verbose dist/*)
+      env:
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.PYPI_PUBLIC_API_TOKEN  }}
+        TWINE_NON_INTERACTIVE: 1