Switching attestation to OIDC token

Signed-off-by: Manuel Lorenzo <mlorenzofr@redhat.com>

Author: mlorenzofr

content/patterns/layered-zero-trust/lzt-secure-supply-chain.adoc

@@ -429,8 +429,8 @@ $ cosign attest \
   --type spdxjson \
   --fulcio-url="${FULCIO_URL}" \
   --rekor-url="${REKOR_URL}" \
+  --identity-token "${OIDC_TOKEN}" \
   --oidc-client-id="${RHTAS_CLIENT_ID}" \
-  --oidc-issuer "${OIDC_ISSUER_URL}" \
   --yes \
   "${IMAGE}"
 ----