bugfix: insecure flag not working for OCI registries with auth

[juan131]

Description

Dealing with OCI registries was failing when authentication was required if the registry used invalid certificates even if the insecure flag was provided. Check the error below:

    ⚠️  Failed syncing "aaa-x.y.z" chart: Failed to push Helm chart: failed to authorize: failed to fetch oauth token: Post "https://REGISTRY_HOST/service/token": tls: failed to verify certificate: x509: “REGISTRY_HOST” certificate is not trusted
    ✘  Error syncing charts: Failed to push Helm chart: failed to authorize: failed to fetch oauth token: Post "https://REGISTRY_HOST/service/token": tls: failed to verify certificate: x509: “REGISTRY_HOST” certificate is not trusted

Changes Made

This PR addresses this issue by ensuring we use an appropriate TLS client configuration when creating the docker authorizer