Add support for GitHub Actions

Closes pypa#159

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: Test cibuildwheel on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, windows-latest, macos-latest]
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      name: Install Python ${{ matrix.python_version }}
+      with:
+        python-version: "3.7"
+
+    - name: Install dependencies
+      run: |
+        python -m pip install -r requirements-dev.txt
+    - name: Install Visual C++ for Python 2.7
+      if: startsWith(matrix.os, 'windows')
+      run: |
+        choco install vcpython27 -f -y
+    - name: Test cibuildwheel
+      run: |
+        python ./bin/run_tests.py

cibuildwheel/__main__.py

@@ -65,7 +65,7 @@ def main():
     if args.platform != 'auto':
         platform = args.platform
     else:
-        ci = strtobool(os.environ.get('CI', 'false')) or 'BITRISE_BUILD_NUMBER' in os.environ or 'AZURE_HTTP_USER_AGENT' in os.environ
+        ci = strtobool(os.environ.get('CI', 'false')) or 'BITRISE_BUILD_NUMBER' in os.environ or 'AZURE_HTTP_USER_AGENT' in os.environ or 'GITHUB_WORKFLOW' in os.environ
         if ci:
             if sys.platform.startswith('linux'):
                 platform = 'linux'