Add tox linting and placeholder unit test

.github/workflows/tox.yaml

@@ -0,0 +1,54 @@
+name: Tox unit tests
+
+on:
+  # We use pull_request_target so that dependabot-created workflows can run
+  pull_request_target:
+    types:
+      - opened
+      - synchronize
+      - ready_for_review
+      - reopened
+    branches:
+      - main
+
+# Use the head ref for workflow concurrency, with cancellation
+# This should mean that any previous workflows for a PR get cancelled when a new commit is pushed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Tox unit tests and linting
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.10']
+
+    steps:
+    - name: Check out the repository
+      uses: actions/checkout@v4
+      with:
+        ref: ${{ inputs.ref || github.ref }}
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install tox
+
+    - name: Test with tox
+      run: tox
+
+    - name: Generate coverage reports
+      run: tox -e cover
+
+    - name: Archive code coverage results
+      uses: actions/upload-artifact@v4
+      with:
+        name: code-coverage-report
+        path: cover/

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./pyhelm3/tests
+top_dir=./

pyhelm3/__init__.py

@@ -1,4 +1,4 @@
-from .client import *
-from .command import *
-from .errors import *
-from .models import *
+from .client import *  # noqa: F403
+from .command import *  # noqa: F403
+from .errors import *  # noqa: F403
+from .models import *  # noqa: F403