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)

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

FEATURE: New `vpn` backend mode. Use `sudo zrok share private --backend-mode vpn` on the _VPN server_ host, then `sudo zrok access private <token>` on _VPN client_ machine. Works with reserved shares using `zrok reserve private --backend-mode vpn`. Use `<target>` parameter to override default VPN network settings `zrok share private -b vpn 192.168.255.42/24` -- server IP is `192.168.255.42` and VPN netmask will be `192.168.255.0/24`. Client IPs are assigned automatically from netmask range.

CHANGE: Update to OpenZiti SDK (`github.com/openziti/sdk-golang`) at `v0.23.22`.

CHANGE: Added indexes to `environments`, `shares`, and `frontends` tables to improve overall query performance on both PostgreSQL and Sqlite.

FIX: Also update the Python SDK to include the permission mode and access grants fields on the `ShareRequest` (https://github.com/openziti/zrok/issues/432)

FIX: Add a way to find the username on Linux when /etc/passwd and stdlib can't resolve the UID (https://github.com/openziti/zrok/issues/454)