Implement realm import/export

[uadrive1]

Once you have setup the realm online, There are two ways to export the JSON

1 Using this script inside the docker container while the Keycloak is running

/usr/local/bin/keycloak-13.0.0/bin/standalone.sh \
-Dkeycloak.migration.action=export \
-Dkeycloak.migration.provider=singleFile \
-Dkeycloak.migration.realmName=inertia-rpi-realm \
-Dkeycloak.migration.file=/tmp/inertia-rpi-realm.json
-Djboss.socket.binding.port-offset=99

Then use a sudo docker cp command to copy the file from inside the container to host.

2 On the realm setup page on Keycloak admin portal, there is an option to download.
Turn ON every option there. I think its a partial download, because the user details did not come through.

Option 1 is preferred.

https://stackoverflow.com/questions/60766292/how-to-get-keycloak-to-export-realm-users-and-then-exit
https://lists.jboss.org/pipermail/keycloak-user/2015-October/003210.html