ostree: Skip signing if $OSTREE_SIGNING_KEY not set
Running the pipeline on a forked repo with $OSTREE_SIGNING_KEY
not being set in the CI/CD panel currently fails.We can just skip signing in that case.
Running the pipeline on a forked repo with $OSTREE_SIGNING_KEY
not being set in the CI/CD panel currently fails.We can just skip signing in that case.