Templates datavirt63-extensions-support-s2i.json and datavirt63-secure-s2i.json don't define the DATAVIRT_TRANSPORT_KEYSTORE_DIR variable.
Instead they provide the keystore location as:

{
    "name": "DATAVIRT_TRANSPORT_KEYSTORE",
    "value": "/etc/datavirt-secret-volume/${HTTPS_KEYSTORE}"
}

That causes the following exception:

java.io.FileNotFoundException: /etc/datavirt-secret-volume/etc/datavirt-secret-volume/keystore.jks (No such file or directory)

See which variables are expanded (${DATAVIRT_TRANSPORT_KEYSTORE_DIR-$HTTPS_KEYSTORE_DIR})