Migrate deps management from Pip to Poetry

Pip doesn't do a good job of separating the direct and transitive
dependancies of a Python application - there is just a single
'requirements.txt' which lists both.

Given other Pinecone libraries (pinecone-python-client) have migrated
to Poetry, do the same here for improved dependancy management and
consistency of tooling.

.github/actions/create-index/action.yml

@@ -43,7 +43,7 @@ runs:
     - name: Create index
       id: create-index
       shell: bash
-      run: python3 tests/scripts/create_index.py
+      run: poetry run python3 tests/scripts/create_index.py
       env:
         PINECONE_API_KEY: ${{ inputs.PINECONE_API_KEY }}
         NAME_PREFIX: ${{ inputs.name_prefix }}

.github/actions/delete-index/action.yml

@@ -15,7 +15,7 @@ runs:
   steps:
     - name: Delete index
       shell: bash
-      run: python3 tests/scripts/delete_index.py
+      run: poetry run python3 tests/scripts/delete_index.py
       env:
         PINECONE_API_KEY: ${{ inputs.PINECONE_API_KEY }}
         INDEX_NAME: ${{ inputs.index_name }}

.github/workflows/python-package.yml

@@ -31,17 +31,22 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Install Poetry
+      uses: snok/install-poetry@v1
+      with:
+        version: 1.8.1
+        virtualenvs-create: true
+        virtualenvs-in-project: true
+        installer-parallel: true
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        poetry install --no-interaction --no-root
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        poetry run flake8 . --extend-exclude .venv --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        poetry run flake8 . --extend-exclude .venv --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Create test index
       id: create-index
       uses: ./.github/actions/create-index
@@ -52,7 +57,7 @@ jobs:
         PINECONE_API_KEY: ${{ secrets.PINECONE_API_KEY }}
     - name: Test with pytest
       run: |
-        pytest
+        poetry run pytest
       env:
         PINECONE_API_KEY: '${{ secrets.PINECONE_API_KEY }}'
         INDEX_HOST: ${{ steps.create-index.outputs.index_host }}