Add debug output to container action to diagnose test output issue

Added debug logging to show:
- Container working directory and environment
- Python and tox versions available
- Workspace file listing
- Command execution and exit codes

This will help identify why Linux Docker tests run quickly but produce no output.

Author: dflook

.github/actions/run-in-container/action.yml

@@ -115,7 +115,16 @@ runs:
         fi
 
         cat <<"EOF" >"$RUNNER_TEMP/run.sh"
+        echo "=== Container Debug Info ==="
+        echo "Working directory: $(pwd)"
+        echo "Python version: $(python --version 2>&1 || echo 'python not found')"
+        echo "Python2.7 version: $(python2.7 --version 2>&1 || echo 'python2.7 not found')"
+        echo "Tox version: $(tox --version 2>&1 || echo 'tox not found')"
+        echo "Files in workspace:"
+        ls -la
+        echo "=== Running command: ${INPUT_RUN} ==="
         ${INPUT_RUN}
+        echo "=== Command exit code: $? ==="
         EOF
         
         set -x