Add the build & publish workflow

.github/workflows/build-and-publish.yml

@@ -0,0 +1,38 @@
+name: Build & Publish
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/build-and-publish.yml"
+      - "setup.*"
+
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "The branch, tag or SHA to release from"
+        required: true
+        default: "master"
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.inputs.branch }}
+      - name: Install Python
+        uses: actions/setup-python@v2
+      - name: Install build dependencies
+        run: python -m pip install --upgrade pip build
+      - name: Build wheels
+        run: python -m build
+      - name: What will we publish?
+        run: ls -l dist
+      - name: Publish
+        if: github.event.inputs.branch != ''
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}
+          skip_existing: true

.gitignore

@@ -1,3 +1,5 @@
+dist
+*.egg-info
 __pycache__
 venv
 .vscode