Add CI for Python client

.github/workflows/python-client.yml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will build a Python project with Poetry and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://docs.github.com/en/actions/use-cases-and-examples/building-and-testing/building-and-testing-python
+
+name: Python CI with Poetry
+
+on:
+  push:
+    branches: [ "main" ]
+    paths:
+      - 'client/python/**'
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - 'client/python/**'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11"]
+
+    steps:
+      - name: Checkout Polaris project
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Cache Poetry
+        id: cache-poetry
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pypoetry
+          key: ${{ runner.os }}-poetry-${{ hashFiles('client/python/poetry.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-poetry-
+
+      - name: Install Poetry
+        if: steps.cache-poetry.outputs.cache-hit != 'true'
+        run: |
+          curl -sSL https://install.python-poetry.org | python3 - --version 1.8.5
+          export PATH="$HOME/.local/bin:$PATH"
+
+      - name: Install dependencies
+        working-directory: client/python
+        run: poetry install
+
+      - name: Lint with flake8
+        working-directory: client/python
+        run: |
+          poetry run flake8 --select=E9,F63,F7,F82 --max-line-length=127 --statistics
+
+      - name: Test with pytest
+        working-directory: client/python
+        run: |
+          export SCRIPT_DIR="non-existing-mock-directory"
+          poetry run pytest