Zrok

FIX: The migration `sqlite3/015_v0_4_19_share_unique_name_constraint.sql` has been adjusted to delete the old `shares_old` table as the last step of the migration process. Not sure exactly why, but SQLite is unhappy otherwise (https://github.com/openziti/zrok/issues/504)

FIX: Email addresses have been made case-insensitive. Please note that there is a migration included in this release (`016_v0_4_21_lowercase_email.sql`) which will attempt to ensure that all email addresses in your existing database are stored in lowercase; **if this migration fails you will need to manually remediate the duplicate account entries** (https://github.com/openziti/zrok/issues/517)

FIX: Stop sending authentication cookies to non-authenticated shares (https://github.com/openziti/zrok/issues/512)

FEATURE: New "limits classes" limits implementation (https://github.com/openziti/zrok/issues/606). This new feature allows for extensive limits customization on a per-user basis, with fallback to the global defaults in the controller configuration.

CHANGE: The controller configuration version has been updated to version `4` (`v: 4`) to support the new limits global configuration changes (https://github.com/openziti/zrok/issues/606).

CHANGE: A new `ZROK_CTRL_CONFIG_VERSION` environment variable now exists to temporarily force the controller to assume a specific controller configuration version, regardless of what version exists in the file. This allows two different config versions to potentially be co-mingled in the same controller configuration file. Use with care (https://github.com/openziti/zrok/issues/648)

CHANGE: Log messages that said `backend proxy endpoint` were clarified to say `backend target`.

FIX: Correct the syntax for the Docker and Linux zrok-share "frontdoor" service that broke OAuth email address pattern matching.

FIX: Fix to the Node.js release process to properly support releasing on a tag.

FIX: Backed out an incorrect change to support a FreeBSD port in progress.

FEATURE: Node.js support for the zrok SDK (https://github.com/openziti/zrok/issues/400)

FEATURE: A Docker Compose project for self-hosting a zrok instance and [accompanying Docker guide](https://docs.zrok.io/docs/guides/self-hosting/docker) for more information.

CHANGE: the container images run as "ziggy" (UID 2171) instead of the generic restricted user "nobody" (UID 65534). This reduces the risk of unexpected file permissions when binding the Docker host's filesystem to a zrok container.

CHANGE: the Docker sharing guides were simplified and expanded