fix: #214 Add cosign flags to stay on previous signature format

Signed-off-by: Laurent Broudoux <laurent.broudoux@gmail.com>

Author: lbroudoux

.github/workflows/build-verify.yml

@@ -111,4 +111,4 @@ jobs:
           for tag in ${TAGS}; do
             images+="${tag}@${DIGEST} "
           done
-          cosign sign --yes ${images}
+          cosign sign --new-bundle-format=false --use-signing-config=false --yes ${images}