feedback: use Tag regex from OCI spec

see also https://github.com/opencontainers/distribution-spec/blob/e612a6e1e1bc717f9fa7e1feb4f05c8b6568754a/spec.md?plain=1#L164-L166

Signed-off-by: tarilabs <[email protected]>

Author: tarilabs

api/lmes/v1alpha1/lmevaljob_types.go

@@ -474,7 +474,8 @@ type OCISpec struct {
 	Repository string `json:"repository"`
 	// Optional tag for the artifact (defaults to job name if not specified)
 	// +optional
-	// +kubebuilder:validation:Pattern=`^[a-zA-Z0-9._-]*$`
+	// +kubebuilder:validation:Pattern=`^[a-zA-Z0-9_][a-zA-Z0-9._-]{0,127}$`
+	// +kubebuilder:validation:MaxLength=128
 	Tag string `json:"tag,omitempty"`
 	// Subject for the OCI artifact
 	// +optional

config/crd/bases/trustyai.opendatahub.io_lmevaljobs.yaml

@@ -352,7 +352,8 @@ spec:
                       tag:
                         description: Optional tag for the artifact (defaults to job
                           name if not specified)
-                        pattern: ^[a-zA-Z0-9._-]*$
+                        maxLength: 128
+                        pattern: ^[a-zA-Z0-9_][a-zA-Z0-9._-]{0,127}$
                         type: string
                       username:
                         description: Username for registry authentication