Support docker qemu emulation in any linux env

- currently just prints out envs

.github/workflows/test.yml

@@ -47,6 +47,13 @@ jobs:
       id: pr-labels
       uses: joerick/pr-labels-action@v1.0.6
 
+    - name: Set up QEMU
+      id: qemu
+      uses: docker/setup-qemu-action@v1
+      with:
+        platforms: all
+      if: runner.os == "Linux"
+
     - name: Sample build
       if: contains(steps.pr-labels.outputs.labels, ' ci-sample-build ')
       run: |

cibuildwheel/linux.py

@@ -13,6 +13,8 @@ from .util import (BuildOptions, BuildSelector, NonPlatformWheelError,
 
 
 def matches_platform(identifier: str) -> bool:
+    output = subprocess.check_output(['docker', '--version'])
+    print("We found support for these platforms:", output)
     pm = platform.machine()
     if pm == "x86_64":
         # x86_64 machines can run i686 docker containers