When building a custom Connect image, the following error can be seen when downloading artifacts from an untrusted HTTPs endpoint (self-signed custom CA).

curl: (60) Peer's certificate issuer has been marked as not trusted by the user.

The workaround here is to turn off curl's verification of the certificate like this.

  build:
    output:
      type: docker
      image: changeit
    plugins:
      - name: gridgain-connector
        artifacts:
          - type: zip
            url: https://download.example.com/files/gridgain-kafka-connect.zip -k 

We should improve endpoint validation to not allow that kind of hacks and provide that functionality as a feature.