build(docker): set major version channel tags to prevent major breaking changes (`1`, `2-next`, ...)

closes #328

## [1.15.4](v1.15.3...v1.15.4) (2026-02-19)

### Bug Fixes

* **emails:** display verification link in clear text for email clients only displaying text ([37c89df3](37c89df3)), closes [#328](#328)