demo_content does not honor chosen domain name

[ctgraham]

The demo_content subcommand does not utilize the DOMAIN variable if edited from the default of "islandora.traefik.me".

Steps to reproduce:

sed -i "s/^DOMAIN=islandora.traefik.me/DOMAIN=$HOSTNAME/" sample.env
make demo

Error message:

...
cd islandora_workbench && docker run -it --rm --network="host" -v "/opt/isle-dc"/islandora_workbench:/workbench --name my-running-workbench workbench-docker bash -lc "./workbench --config /workbench/islandora_workbench_demo_content/example_content.yml"
Error: Content type islandora_object does not exist on https://islandora.traefik.me.

make[1]: *** [Makefile:478: demo_content] Error 1
make[1]: Leaving directory '/opt/isle-dc'
make: *** [Makefile:133: demo] Error 2

Proposed resolution:
sed the "host" value in islandora_workbench/islandora_workbench_demo_content/example_content.yml.

[DonRichards]

PR #334

[joecorall]

#334 merged so closing this issue