Add create command to prevent external: true warnings

[codiflow]

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What does this PR include?

Short Description

This is related to #5970 and https://community.mailcow.email/d/2126-backup-restore/2

It adds docker compose create to the script which gets executed directly after the sync of the mailcow-dockerized directory. This way the Docker daemon on the remote side creates everything (so the volumes are "owned" by the remote side) and we get rid of the warning volume "XYZ" already exists but was not created by Docker Compose. Use 'external: true' to use an existing volume

This is helpful especially if you use the script create-cold-standby.sh to migrate your mailcow installation to another server and don't want to get those warnings after the migration.

Affected Containers

Script: create-cold-standby.sh

Did you run tests?

Sure 😎

What did you test?

I modified the script like in this PR and tested it during a mail server migration.

What were the final results? (Awaited, got)

No more warnings like volume "XYZ" already exists but was not created by Docker Compose. Use 'external: true' to use an existing volume:

Output on local side:

[...]

Preparing remote...
Synchronizing mailcow base directory...
Creating networks, volumes and containers on remote...
 Network mailcowdockerized_mailcow-network  Creating
 Network mailcowdockerized_mailcow-network  Created
 Volume "mailcowdockerized_solr-vol-1"  Creating
 Volume "mailcowdockerized_solr-vol-1"  Created
 Volume "mailcowdockerized_vmail-vol-1"  Creating
 Volume "mailcowdockerized_vmail-vol-1"  Created
 Volume "mailcowdockerized_sogo-userdata-backup-vol-1"  Creating
 Volume "mailcowdockerized_sogo-userdata-backup-vol-1"  Created
 Volume "mailcowdockerized_rspamd-vol-1"  Creating
 Volume "mailcowdockerized_rspamd-vol-1"  Created
 Volume "mailcowdockerized_crypt-vol-1"  Creating
 Volume "mailcowdockerized_crypt-vol-1"  Created
 Volume "mailcowdockerized_clamd-db-vol-1"  Creating
 Volume "mailcowdockerized_clamd-db-vol-1"  Created
 Volume "mailcowdockerized_sogo-web-vol-1"  Creating
 Volume "mailcowdockerized_sogo-web-vol-1"  Created
 Volume "mailcowdockerized_mysql-socket-vol-1"  Creating
 Volume "mailcowdockerized_mysql-socket-vol-1"  Created
 Volume "mailcowdockerized_mysql-vol-1"  Creating
 Volume "mailcowdockerized_mysql-vol-1"  Created
 Volume "mailcowdockerized_postfix-vol-1"  Creating
 Volume "mailcowdockerized_postfix-vol-1"  Created
 Volume "mailcowdockerized_redis-vol-1"  Creating
 Volume "mailcowdockerized_redis-vol-1"  Created
 Volume "mailcowdockerized_vmail-index-vol-1"  Creating
 Volume "mailcowdockerized_vmail-index-vol-1"  Created
 Container mailcowdockerized-memcached-mailcow-1  Creating
 Container mailcowdockerized-netfilter-mailcow-1  Creating
 Container mailcowdockerized-dockerapi-mailcow-1  Creating
 Container mailcowdockerized-unbound-mailcow-1  Creating
 Container mailcowdockerized-sogo-mailcow-1  Creating
 Container mailcowdockerized-olefy-mailcow-1  Creating
 Container mailcowdockerized-dockerapi-mailcow-1  Created
 Container mailcowdockerized-olefy-mailcow-1  Created
 Container mailcowdockerized-netfilter-mailcow-1  Created
 Container mailcowdockerized-redis-mailcow-1  Creating
 Container mailcowdockerized-solr-mailcow-1  Creating
 Container mailcowdockerized-unbound-mailcow-1  Created
 Container mailcowdockerized-mysql-mailcow-1  Creating
 Container mailcowdockerized-clamd-mailcow-1  Creating
 Container mailcowdockerized-memcached-mailcow-1  Created
 Container mailcowdockerized-sogo-mailcow-1  Created
 Container mailcowdockerized-clamd-mailcow-1  Created
 Container mailcowdockerized-solr-mailcow-1  Created
 Container mailcowdockerized-redis-mailcow-1  Created
 Container mailcowdockerized-php-fpm-mailcow-1  Creating
 Container mailcowdockerized-mysql-mailcow-1  Created
 Container mailcowdockerized-dovecot-mailcow-1  Creating
 Container mailcowdockerized-postfix-mailcow-1  Creating
 Container mailcowdockerized-dovecot-mailcow-1  Created
 Container mailcowdockerized-rspamd-mailcow-1  Creating
 Container mailcowdockerized-ofelia-mailcow-1  Creating
 Container mailcowdockerized-postfix-mailcow-1  Created
 Container mailcowdockerized-php-fpm-mailcow-1  Created
 Container mailcowdockerized-nginx-mailcow-1  Creating
 Container mailcowdockerized-ofelia-mailcow-1  Created
 Container mailcowdockerized-rspamd-mailcow-1  Created
 Container mailcowdockerized-nginx-mailcow-1  Created
 Container mailcowdockerized-acme-mailcow-1  Creating
 Container mailcowdockerized-acme-mailcow-1  Created
 Container mailcowdockerized-watchdog-mailcow-1  Creating
 Container mailcowdockerized-watchdog-mailcow-1  Created
Running redis-cli save... OK
Creating remote mountpoint /var/lib/docker/volumes/mailcowdockerized_clamd-db-vol-1/_data for mailcowdockerized_clamd-db-vol-1...
Synchronizing mailcowdockerized_clamd-db-vol-1 from local /var/lib/docker/volumes/mailcowdockerized_clamd-db-vol-1/_data...

[...]

This is also "repeat-proof" so the command does not produce any additional output after everything has been created successfully on initial execution.

Output on remote side after starting the containers:

[DerLinkman]

Thank you very much!