Release to PyPI via GitHub Actions.

Also disable universal wheels as bidict is no longer Py2-compatible.

.github/workflows/release-to-pypi.yml

@@ -0,0 +1,24 @@
+name: Release to PyPI
+on:
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+"
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      with:
+        python-version: "3.9"
+    - name: Prepare Env
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools wheel
+    - name: Build
+      run: python setup.py sdist bdist_wheel
+    - name: Publish
+      uses: pypa/gh-action-pypi-publish@v1.4.1
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}

.github/workflows/release-to-test-pypi.yml

@@ -0,0 +1,35 @@
+name: Release to Test PyPI
+on:
+  push:
+    tags:
+      # To publish a test release to test.pypi.org,
+      # create and push a tag as follows:
+      #     git tag -a 0.21.3.dev27 -m "Tag 0.21.3.dev27 for release to test.pypi.org"
+      #     git push --tags
+      # Go to https://github.com/jab/bidict/actions?query=workflow%3A%22Release+to+Test+PyPI%22
+      # and watch for a new run of this workflow to publish to test.pypi.org.
+      # IMPORTANT: Run the following to clean up after:
+      #     git tag -d 0.21.3.dev27
+      #     git push origin :0.21.3.dev27
+      - "[0-9]+.[0-9]+.[0-9]+.dev[0-9]+"
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      with:
+        python-version: "3.9"
+    - name: Prepare Env
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools wheel
+    - name: Build
+      run: python setup.py sdist bdist_wheel
+    - name: Publish
+      uses: pypa/gh-action-pypi-publish@v1.4.1
+      with:
+        user: __token__
+        password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+        repository_url: https://test.pypi.org/legacy/
+        verbose: true

setup.cfg

@@ -7,7 +7,8 @@
 
 # https://wheel.readthedocs.io/en/stable/user_guide.html#building-wheels
 [bdist_wheel]
-universal = 1
+# No longer Python 2-compatible -> disable universal wheels:
+universal = 0
 
 
 # http://flake8.pycqa.org/en/latest/user/configuration.html