Add linter exception

Signed-off-by: Javier Rodriguez <javier@chainloop.dev>

Author: javirln

app/cli/pkg/action/attestation_add.go

@@ -104,6 +104,7 @@ func (action *AttestationAdd) Run(ctx context.Context, attestationID, materialNa
 			return nil, fmt.Errorf("failed to get CAS backend: %w", getCASBackendErr)
 		}
 		if connectionCloserFn != nil {
+			// nolint: errcheck
 			defer connectionCloserFn()
 		}
 	}

app/cli/pkg/action/attestation_init.go

@@ -238,6 +238,7 @@ func (action *AttestationInit) Run(ctx context.Context, opts *AttestationInitRun
 			action.Logger.Warn().Err(err).Msg("unexpected error getting CAS backend")
 		}
 		if connectionCloserFn != nil {
+			// nolint: errcheck
 			defer connectionCloserFn()
 		}
 	}