v4.1.8

## What's Changed
* fix(ci): keep publishing release images when one variant fails by @rajnandan1 in https://github.com/rajnandan1/kener/pull/866
* fix(ui): keep incident and maintenance duration below the navbar by @rajnandan1 in https://github.com/rajnandan1/kener/pull/867
* feat(heartbeat): let users set the heartbeat secret by @rajnandan1 in https://github.com/rajnandan1/kener/pull/869
* fix(api): run the proxy URL check on v4 monitor create and update by @rajnandan1 in https://github.com/rajnandan1/kener/pull/870
* Test the live demo at kener.ing with surface by @rajnandan1 in https://github.com/rajnandan1/kener/pull/875
* Remove the surface trial by @rajnandan1 in https://github.com/rajnandan1/kener/pull/876
* feat(subscriptions): state and impact flags for subscriber mail templates by @codekuu in https://github.com/rajnandan1/kener/pull/873
* Shrink the agent docs from 183 always-loaded lines to 28, and fix 8 wrong facts by @rajnandan1 in https://github.com/rajnandan1/kener/pull/880
* Show hidden monitors to signed-in users with monitors.read, and stop inline incidents leaking them by @rajnandan1 in https://github.com/rajnandan1/kener/pull/881
* fix(monitors): warn when $SECRET is sent over plain http (#834) by @lokiee0 in https://github.com/rajnandan1/kener/pull/844
* Stop maintenance emails and /maintenances/{id} page data from leaking hidden monitors by @rajnandan1 in https://github.com/rajnandan1/kener/pull/884
* Stop emailing events that affect only hidden monitors, and count only visible monitors in the incident impact by @rajnandan1 in https://github.com/rajnandan1/kener/pull/885
* fix(incidents): notify subscribers of comments posted through the v4 API by @andrewmitchell-automations in https://github.com/rajnandan1/kener/pull/887
* feat(ssl): show certificate expiry UI and harden TLS checks by @phatlet in https://github.com/rajnandan1/kener/pull/878
* Make every v4 API write do what the same dashboard write does by @rajnandan1 in https://github.com/rajnandan1/kener/pull/889
* feat(api): upload images through POST /api/v4/images by @rajnandan1 in https://github.com/rajnandan1/kener/pull/890
* fix(deps): protobufjs, proxy-addr and shell-quote past three critical advisories by @codekuu in https://github.com/rajnandan1/kener/pull/891
* fix(monitor-bars): fall back when days or endOfDayTodayAtTz is not a number by @anandghegde in https://github.com/rajnandan1/kener/pull/847
* Save an empty secret, not the mask, when site data arrives masked and no secret is stored yet by @rajnandan1 in https://github.com/rajnandan1/kener/pull/892
* fix(embed): fall back when days, height, or timezone gives NaN by @rajnandan1 in https://github.com/rajnandan1/kener/pull/895
* feat(docker): start a new Docker monitor on DOCKER_HOST by @rajnandan1 in https://github.com/rajnandan1/kener/pull/894
* feat(events): let inline events and the event list work together (#877) by @rajnandan1 in https://github.com/rajnandan1/kener/pull/896
* docs(changelog): add v4.1.8 changelog by @rajnandan1 in https://github.com/rajnandan1/kener/pull/897

## New Contributors
* @codekuu made their first contribution in https://github.com/rajnandan1/kener/pull/873
* @andrewmitchell-automations made their first contribution in https://github.com/rajnandan1/kener/pull/887
* @anandghegde made their first contribution in https://github.com/rajnandan1/kener/pull/847

**Full Changelog**: https://github.com/rajnandan1/kener/compare/v4.1.7...v4.1.8