build: Add token for coverage test

The code coverage action is silently failing partly because the required
Codecov token is missing.
Reading the token from the GitHub secrets.

The missing gpg package must be fixed in
https://github.com/linux-nvme/ci-containers.

Furthermore, fail the coverage workflow if the codecov-action errors out.

Signed-off-by: Dennis Maisenbacher <[email protected]>

Author: MaisenbacherD

.github/workflows/coverage.yml

@@ -19,4 +19,5 @@ jobs:
           scripts/build.sh coverage
       - uses: codecov/codecov-action@v4
         with:
-          fail_ci_if_error: false
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true