Show more information for Windows coverage run on GHA

Author: Flamefire

.github/workflows/ci.yml

@@ -478,8 +478,12 @@ jobs:
       - name: Show config before collecting coverage
         if: matrix.coverage
         run: |
+          type %BOOST_ROOT%/project-config.jam
           set B2_TARGETS=libs/%SELF%/test//show_config --verbose-test
-          ci\build.bat
+          set B2_FLAGS=--debug-configuration
+          ci\build.bat || exit /b 1
+          echo Config log:
+          type %BOOST_ROOT%/bin.v2/config.log
         env:
           B2_TOOLSET: ${{matrix.toolset}}
           B2_CXXSTD: ${{matrix.cxxstd}}