HCIDOCS-635: Add note that SSL certificates for ISO installation on SNO are only valid for 24 hours.

Author: kdrake20

modules/install-sno-generating-the-install-iso-manually.adoc

@@ -199,7 +199,7 @@ $ cp install-config.yaml ocp
 ----
 $ ./openshift-install --dir=ocp create single-node-ignition-config
 ----
-
++
 . Embed the ignition data into the {op-system} ISO by running the following commands:
 +
 [source,terminal]
@@ -213,6 +213,11 @@ $ alias coreos-installer='podman run --privileged --pull always --rm \
 ----
 $ coreos-installer iso ignition embed -fi ocp/bootstrap-in-place-for-live-iso.ign rhcos-live.iso
 ----
++
+[IMPORTANT]
+====
+The SSL certificates for the {op-system} ISO installation image are only valid for 24 hours. If you use the ISO image to install a node more than 24 hours after creating the image, the installation can fail. To re-create the image after 24 hours, delete the `ocp` directory and re-create the {product-title} assets.
+====
 endif::openshift-origin[]
 ifdef::openshift-origin[]
 . Generate {product-title} assets by running the following commands:
@@ -245,4 +250,4 @@ $ alias coreos-installer='podman run --privileged --pull always --rm \
 ----
 $ coreos-installer iso ignition embed -fi sno/bootstrap-in-place-for-live-iso.ign fcos-live.iso
 ----
-endif::openshift-origin[]
+endif::openshift-origin[]