Update values to add sylva_base_oci_registry

Lupescu Danielrequested to merge
dlu_add_sylva_base_oci into main

After adding oci_registry_extra_ca_certs we also need to add the correct sylva_base_oci_registry to avoid invalid certificate signing issues as seen in test2.

# test1 towards my custom registry with CA trust
helm pull oci://172.20.x.x/proxy_cache_registry.gitlab.com/sylva-projects/sylva-core/rke2-calico-crd:v3.31.200 --ca-file /tmp/ca-file.pem
Pulled: 172.20..x.x/proxy_cache_registry.gitlab.com/sylva-projects/sylva-core/rke2-calico-crd:v3.31.200
Digest: sha256:f1df2c9ca674d956c79ba63bfcbd6a9392d16b0506e15473b2f06f6f241c6a61

# test2 towards registry gitlab using an invalid CA trust 
helm pull oci://registry.gitlab.com/sylva-projects/sylva-core/rke2-calico-crd:v3.31.200 --ca-file /tmp/ca-file.pem
Error: failed to perform "FetchReference" on source: Get "https://registry.gitlab.com/v2/sylva-projects/sylva-core/rke2-calico-crd/manifests/v3.31.200": tls: failed to verify certificate: x509: certificate signed by unknown authority

# test3 towards registry gitlab with no CA trust needed
helm pull oci://registry.gitlab.com/sylva-projects/sylva-core/rke2-calico-crd:v3.31.200
Pulled: registry.gitlab.com/sylva-projects/sylva-core/rke2-calico-crd:v3.31.200
Digest: sha256:f1df2c9ca674d956c79ba63bfcbd6a9392d16b0506e15473b2f06f6f241c6a61

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