Revert "Fix envsubst of instance name"
Revert "Fix envsubst of instance name"

This reverts commit 8aa4b891f21c9dc783aa57860bcb6317e3394888.

digibib/koha-salt-docker,digibib/koha-docker,digibib/koha-docker,digibib/koha-docker,digibib/koha-salt-docker,digibib/koha-salt-docker,digibib/koha-docker,digibib/koha-docker,digibib/koha-salt-docker,digibib/koha-docker,digibib/koha-salt-docker