cd: publish pip package

Publish pip package on tag.

To test, comment "run only on tags" condition, change PYPI_REPO
to testpypi and use ${{ secrets.TEST_PYPI_TOKEN }} as PYPI_TOKEN. You
also need to remove 5dfdae5 commit
changes about scm version and set some constant version: using local
version identifiers [1] is not allowed by test.pypi.org.

1. https://peps.python.org/pep-0440/

Part of #198

Author: DifferentialOrange

Diff for: .github/workflows/packing.yml

@@ -170,3 +170,39 @@ jobs:
         run: |
           cat tarantool.log || true
           kill $(cat tarantool.pid) || true
+
+  publish_pip:
+    if: startsWith(github.ref, 'refs/tags')
+
+    needs:
+      - run_tests_pip_package_linux
+      - run_tests_pip_package_windows
+
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+
+    steps:
+      - name: Clone the connector repo
+        uses: actions/checkout@v3
+
+      - name: Setup Python and basic packing tools
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+
+      - name: Install tools for package publishing
+        run: pip3 install twine
+
+      - name: Download pip package artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: pip_dist
+          path: pip_dist
+
+      - name: Publish artifacts
+        run: make pip-dist-publish
+        env:
+          PYPI_REPO: pypi
+          PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}

Diff for: CHANGELOG.md

@@ -186,6 +186,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Support iproto feature push (#201).
 - Pack pip package with GitHub Actions (#198).
+- Publish pip package with GitHub Actions (#198).
 
 ### Changed
 - Bump msgpack requirement to 1.0.4 (PR #223).

Diff for: Makefile

@@ -47,3 +47,7 @@ pip-dist: pip-sdist pip-bdist
 .PHONY: pip-dist-check
 pip-dist-check:
 	twine check pip_dist/*
+
+.PHONY: pip-dist-publish
+pip-dist-publish:
+	twine upload -r testpypi -u __token__ -p ${PYPI_TOKEN} pip_dist/*