ci: inherit secrets to pass Codecov token to "test" workflow call

Apparently in GitHub Actions only the GITHUB_TOKEN secret is automatically
passed to workflow calls while all other secrets are not. [1] To allow that one
can either pass them as named secrets or by setting "secrets: inherit" on the
workflow call. We do the later since it's simple enough for our use case.

[1] https://docs.github.com/en/actions/using-workflows/reusing-workflows#overview

.github/workflows/change.yml

@@ -46,6 +46,7 @@ jobs:
   test:
     uses: ./.github/workflows/test.yml
     needs: clang-build
+    secrets: inherit
     with:
       image: registry.gitlab.com/kwinft/ci-images/archlinux/kwinft-base-master
       artifact-name: clang-build