Use LXC_TIMEZONE in nextcloud/mailpiler instead of hardcoded "Europe/Berlin"

[hpannenb]

Nextcloud and mailpiler installation scripts do not use the configured LXC_TIMEZONE of zamba.conf but "Europe/Berlin" hardcoded instead.

[hpannenb]

Nextcloud:

• https://github.com/bashclub/zamba-lxc-toolbox/blob/aea812c9e69d9522dc5d280ee85f1a23b987a000/src/nextcloud/install-service.sh#L27
• https://github.com/bashclub/zamba-lxc-toolbox/blob/aea812c9e69d9522dc5d280ee85f1a23b987a000/src/nextcloud/install-service.sh#L63
• https://github.com/bashclub/zamba-lxc-toolbox/blob/aea812c9e69d9522dc5d280ee85f1a23b987a000/src/nextcloud/install-service.sh#L70
• https://github.com/bashclub/zamba-lxc-toolbox/blob/aea812c9e69d9522dc5d280ee85f1a23b987a000/src/nextcloud/install-service.sh#L378 Mailpiler:
• https://github.com/bashclub/zamba-lxc-toolbox/blob/f3a0ab1d6691fe5ac59430780c0aa293e80e21e8/src/mailpiler/install-service.sh#L146

[hpannenb]

For line 63 and 70 it is maybe better to use "s|;date.timezone.*|date.timezone = $LXC_TIMEZONE|" to make it work without escaping (Source: https://www.brianchildress.co/using-variables-with-sed/)

[hpannenb]

Installing nextcloud with e.g. LXC_TIMEZONE="Europe/Amsterdam" works as supposed to. Mailpiler's container uses this as well now. Issue fixed. Thanks for all the effort spent.