build: display free disk space after build in the test-macOS workflow

PR-URL: #55025
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

.github/workflows/test-macos.yml

@@ -81,5 +81,7 @@ jobs:
           echo "::endgroup::"
       - name: Build
         run: make build-ci -j$(getconf _NPROCESSORS_ONLN) V=1 CONFIG_FLAGS="--error-on-warn"
+      - name: Free Space After Build
+        run: df -h
       - name: Test
         run: make run-ci -j$(getconf _NPROCESSORS_ONLN) V=1 TEST_CI_ARGS="-p actions --node-args='--test-reporter=spec' --node-args='--test-reporter-destination=stdout' --measure-flakiness 9"