Resolve "php cache collisions for chroot mode php-fpm"

Closes #6177

See merge request ispconfig/ispconfig3!1507

Add Debian 11 (Bullseye) to OS detection code in ISPConfig and update config for Debian testing (Sid)

Merge branch '6216-installation-fails-to-generate-le-certificate-running-forced-update-nightly-succeeds' into 'develop'

Resolve "Installation fails to generate LE certificate - running forced update nightly succeeds."

Closes #6216

See merge request !1509

Merge branch '6216-installation-fails-to-generate-le-certificate-running-forced-update-nightly-succeeds' into 'develop'

Resolve "Installation fails to generate LE certificate - running forced update nightly succeeds."

Closes #6216

See merge request ispconfig/ispconfig3!1508

Deployment of packages on release

See merge request ispconfig/ispconfig3!1496

Resolve "rename mail_user should update spamfilter_users"

Closes #5484, #6145, #6201, and #6200

See merge request ispconfig/ispconfig3!1500

Resolve "consistent acme.log path"

Closes #6148

See merge request ispconfig/ispconfig3!1473

Resolve "cron_delete php warning"

Closes #6208

See merge request ispconfig/ispconfig3!1503

Resolve "periodically force jailkit update"

Closes #6210

See merge request ispconfig/ispconfig3!1505

Resolve "One letter domains in DNS filtered out by regex"

Closes #6108

See merge request ispconfig/ispconfig3!1445

Merge branch '6121-acme-sh-fails-when-self-signed-certificates-already-exist-for-ispconfig-web-interface' into 'develop'

Resolve "acme.sh fails when self-signed certificates already exist for ISPConfig web interface"

Closes #6121

See merge request !1494

Resolve "Mail Quota doesn't update on backup deletion"

Closes #6190

See merge request !1491

Resolve "IPv6 wildcard config missing in redirect server section"

Closes #6180

See merge request ispconfig/ispconfig3!1489

Resolve "clarify "ISPConfig v2 detected" message"

Closes #6198

See merge request !1498

Resolve "rspamd: enable arc signing"

Closes #6167

See merge request !1482

Resolve "deleting spamfilter_users should delete linked spamfilter_wblist"

Closes #6199

See merge request ispconfig/ispconfig3!1499

Update 500-backup_mail.inc.php Disable quota and ACLS when doing a backup of mdbox mailboxes with dsnyc

Resolve "Improve session security"

Closes #6179

See merge request !1488