prepare ldap for multiserver (#169)

* add multi-server attributes to ldif
* add  example compose file for a multiserver
* add readme
* add script for database creation within the existing database instance
* add generation of admin.pem
* add own certificate for kopano_server_2
* add admin.pem to compose (only for multiserver)
* add spooler for 2nd node
* add link to ldap demo readme

database/README.md

@@ -0,0 +1,5 @@
+# Database helpers
+
+# create-multiple-databases.sh
+
+Script to create additional databases during the initial container startup. Based on https://github.com/mrts/docker-postgresql-multiple-databases.

database/create-additional-databases.sh

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+#!/bin/bash
+
+set -eu
+
+mysql=${mysql:?}
+
+function create_user_and_database() {
+	local database=$1
+	echo "  Creating database '$database'"
+	echo "CREATE DATABASE IF NOT EXISTS ${database};" | "${mysql[@]}"
+	echo "GRANT ALL PRIVILEGES ON ${database}.* TO '${MYSQL_USER}';" | "${mysql[@]}"
+}
+
+if [ -n "$MYSQL_ADDITIONAL_DATABASES" ]; then
+	echo "Multiple database creation requested: $MYSQL_ADDITIONAL_DATABASES"
+	for db in $(echo "$MYSQL_ADDITIONAL_DATABASES" | tr ',' ' '); do
+		create_user_and_database "$db"
+	done
+	echo "Additional databases created"
+fi