cd: pack pip package

Pack source code and wheel file with Github Actions. Result is stored as
artifact.

Part of #198

Author: DifferentialOrange

Diff for: .github/workflows/packing.yml

@@ -0,0 +1,53 @@
+name: packing
+
+on:
+  push:
+  pull_request:
+  pull_request_target:
+    types: [labeled]
+
+jobs:
+  pack_pip:
+    # We want to run on external PRs, but not on our own internal
+    # PRs as they'll be run by the push to the branch.
+    #
+    # The main trick is described here:
+    # https://github.com/Dart-Code/Dart-Code/pull/2375
+    if: (github.event_name == 'push') ||
+      (github.event_name == 'pull_request' &&
+        github.event.pull_request.head.repo.full_name != github.repository)
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+
+    steps:
+      - name: Clone the connector repo
+        uses: actions/checkout@v2
+
+      - name: Setup Python and basic packing tools
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.10'
+
+      - name: Install tools for packing
+        run: pip install wheel
+
+      - name: Install tools for package verification
+        run: pip install twine
+
+      - name: Pack source code
+        run: python setup.py sdist
+
+      - name: Pack wheel file
+        run: python setup.py bdist_wheel
+
+      - name: Verify the package
+        run: twine check dist/*
+
+      - name: Archive pip artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: pip_dist
+          path: dist
+          retention-days: 1