After hiccups on circleci today suddenly all builds are failing even though the circleci status claims that all issues were resolved. We are using machine executor and the builds are failing due gpg error on circleci/trusty source:
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://packagecloud.io trusty InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 4E6910DFCB68C9CD
What to do here?