Add --disable-dev-shm-usage for Linux CI to fix shared memory failure

CI containers have a small /dev/shm; the renderer subprocess logs
"Failed global descriptor lookup: 7" and CreateBrowserSync() returns
None. --disable-dev-shm-usage tells Chrome to use /tmp instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: linesight

unittests/main_test.py

@@ -147,6 +147,9 @@ def test_main(self):
             # Sandbox setup (user-namespace) fails on CI runners; GPU process
             # also needs --no-sandbox to launch successfully under xvfb.
             switches["no-sandbox"] = ""
+            # /dev/shm is too small in CI containers; renderer subprocess
+            # fails shared-memory descriptor lookup (global descriptor 7).
+            switches["disable-dev-shm-usage"] = ""
         cef.Initialize(settings, switches=switches)
         subtest_message("cef.Initialize() ok")
 

unittests/osr_test.py

@@ -116,6 +116,9 @@ def test_osr(self):
             # Sandbox setup fails on CI runners; subprocess won't launch
             # without this under xvfb even with --disable-gpu.
             switches["no-sandbox"] = ""
+            # /dev/shm is too small in CI containers; renderer subprocess
+            # fails shared-memory descriptor lookup (global descriptor 7).
+            switches["disable-dev-shm-usage"] = ""
         browser_settings = {
             # Tweaking OSR performance (Issue #240)
             "windowless_frame_rate": 30,  # Default frame rate in CEF is 30