push-helm-artifacts fails

Summary

Getting /tools/oci/push-helm-charts-artifacts.sh: line 103: artifact_name: unbound variable error

What is the current bug behavior?

https://gitlab.com/sylva-projects/sylva-core/-/jobs/6924249349

Relevant logs and/or screenshots

/Checking if artifact oci://registry.gitlab.com/sylva-projects/sylva-core/alertmanager-config:0.0.2 exists...

/► pulling artifact from registry.gitlab.com/sylva-projects/sylva-core/alertmanager-config:0.0.2

/✗ GET https://registry.gitlab.com/v2/sylva-projects/sylva-core/alertmanager-config/manifests/0.0.2: MANIFEST_UNKNOWN: manifest unknown; map[Tag:0.0.2]

/Successfully packaged chart and saved it to: /builds/sylva-projects/sylva-core/alertmanager-config-0.0.2.tgz

/tools/oci/push-helm-charts-artifacts.sh: line 103: artifact_name: unbound variable

/[ERROR] cannot push and sign alertmanager-config because its content differs from the content of the already existing OCI artifact