Add dedicated nmc setup for container

.devcontainer/apps.config.php

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+<?php
+$CONFIG = array (
+  'apps_paths' => array (
+    0 => array (
+        'path'     => OC::$SERVERROOT.'/customapps',
+        'url'      => '/customapps',
+        'writable' => true,
+    ),
+    1 => array (
+        'path'     => OC::$SERVERROOT.'/apps',
+        'url'      => '/apps',
+        'writable' => true,
+    ),
+    ),
+);

.devcontainer/nmc.config.php

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+<?php
+$CONFIG = array (
+    'htaccess.RewriteBase' => '/',
+    'default_language' => 'de_DE',
+    'integrity.check.disabled' => true, // not recommended for prod, but for customisation
+    # 'config_is_read_only' => true,
+    'auth.authtoken.v1.disabled' => true,
+    'sharing.force_share_accept' => true,
+    'status-email-message-provider' => '\\OCA\\EmailTemplateExample\\MessageProvider',
+    'mail_template_class' => 'OCA\\EmailTemplateExample\\EMailTemplate',
+    // "logfile_office_report" => "/var/log/nextcloud/office.log",
+);

.devcontainer/nmcsetup.sh

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+#!/bin/bash
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )/../" >/dev/null 2>&1 && pwd )"
+
+cd $DIR/
+
+# after installation, do some MagentaCLOUD specific setups to start closer to production
+
+# customapps directory split
+cp .devcontainer/apps.config.php config/apps.config.php
+cp .devcontainer/nmc.config.php config/nmc.config.php
+
+# disable user themeing
+sudo -u ${APACHE_RUN_USER} php occ theming:config disable-user-theming yes
+
+# fixed themeing for MagentaCLOUD
+cp .devcontainer/theme.config.php config/theme.config.php
+
+# refresh .htaccess for short URL notation
+sudo -u ${APACHE_RUN_USER} php occ maintenance:update:htaccess
+
+# "Organisational" setting
+sudo -u ${APACHE_RUN_USER} php occ theming:config color "#e20074"   # don't use uppercase letters!
+sudo -u ${APACHE_RUN_USER} php occ theming:config name MagentaCLOUD
+sudo -u ${APACHE_RUN_USER} php occ theming:config slogan "Alle Dateien sicher an einem Ort"
+sudo -u ${APACHE_RUN_USER} php occ theming:config imprintUrl "http://www.telekom.de/impressum"
+sudo -u ${APACHE_RUN_USER} php occ theming:config privacyUrl "https://static.magentacloud.de/Datenschutz"
+
+# app settings
+sudo -u ${APACHE_RUN_USER} php occ config:app:set theming AndroidClientUrl --value \
+    "https://play.google.com/store/apps/details?=com.t_systems.android.webdav"
+sudo -u ${APACHE_RUN_USER} php occ config:app:set theming iTunesAppId --value "312838242"
+sudo -u ${APACHE_RUN_USER} php occ config:app:set theming iOSClientUrl --value \
+    "https://apps.apple.com/us/app/magentacloud-cloud-speicher/id312838242"
+
+# enable/disable apps
+sudo -u ${APACHE_RUN_USER} php occ app:enable nmctheme
+sudo -u ${APACHE_RUN_USER} php occ app:disable dashboard  # may remove as soon as dashboard CR is implemented

.devcontainer/theme.config.php

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+<?php
+$CONFIG = array (
+    'enforce_theme' => 'default',  // or any other theme contained in the app
+    'theme' => '',                    // disable old themeing
+);