GithubActions publish workflow (#188)

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: "3.9"
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: false
+      - name: Install Dependencies
+        run: poetry install
+      - name: Set PyPI token
+        run: poetry config pypi-token.pypi "${{ secrets.PYPI_API_TOKEN }}"
+      - name: Publish package
+        run: poetry publish --build