unify workflows into one single file

Author: ciur

.github/workflows/actions.yml

@@ -11,7 +11,20 @@ jobs:
           python-version: 3.7
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
+          python -m pip install build --user --upgrade pip
           pip install pycodestyle
       - name: Validate PEP8 compliance
-        run: pycodestyle .
+        run: pycodestyle .
+      - name: Build a binary wheel and a source tarball
+        run: >-
+          python -m
+          build
+          --sdist
+          --wheel
+          --outdir dist/
+          .
+      - name: Publish 📦 to PyPI
+        if: startsWith(github.ref, 'refs/tags')
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}