Add release workflow.

.github/workflows/release.yml

@@ -0,0 +1,94 @@
+name: Build sdist and wheels
+
+on:
+  workflow_dispatch:
+    inputs:
+      upload_to_pypi:
+        description: "Upload to PyPI? Y/[N]"
+        default: "N"
+
+jobs:
+  build_sdist:
+    name: Build sdist
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: "3.6"
+
+      - name: Install pip build
+        run: |
+          python -m pip install "build"
+
+      - name: Build sdist tarball
+        shell: bash
+        run: |
+          python -m build --sdist .
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: sdist
+          path: |
+            dist/*.tar.gz
+          if-no-files-found: error
+
+  build_generic_wheel:
+    name: Build generic wheel (without speedups)
+    runs-on: ubuntu-latest
+    env:
+      # Build a wheel without speedups that can run on pure Python
+      GENSHI_BUILD_SPEEDUP: 0
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: "3.6"
+
+      - name: Install pip build
+        run: |
+          python -m pip install "build"
+
+      - name: Build wheel
+        shell: bash
+        run: |
+          python -m build --wheel .
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: wheels
+          path: |
+            dist/*.whl
+          if-no-files-found: error
+
+  deploy:
+    name: "Upload to PyPI if selected"
+    if: github.event.inputs.upload_to_pypi == 'Y'
+    needs: [build_sdist, build_generic_wheel]
+    runs-on: ubuntu-latest
+    env:
+      TWINE_USERNAME: __token__
+      TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
+      TWINE_NON_INTERACTIVE: 1
+      TWINE_REPOSITORY: pypi
+
+    steps:
+      - name: Download build artifacts to local runner
+        uses: actions/download-artifact@v2
+
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: "3.10"
+
+      - name: Install twine
+        run: |
+          python -m pip install "twine"
+
+      - name: Upload sdist and wheel to PyPI
+        run: |
+          python -m twine upload --verbose wheels/*.whl sdist/*.tar.gz

.github/workflows/tests.yml

@@ -1,4 +1,4 @@
-name: run
+name: Run test suite
 
 on: [push, pull_request]