Download OpenPubkey SSH 0.19.0

This release has some significant changes in it,

## JWKS cache.

This should significantly improve performance. Currently it is opt-in and not on by default. Later releases will likely move to opt-in, we want to get more data and catch any issues before having on out of the box. It is curently Linux/macOS only.

To enable it during install：`OPKSSH_INSTALL_CACHE_DIR=/var/cache/opkssh ./install-linux.sh`

It can also be turned on in the config `/etc/opk/config.yml`

We also added a provider request times out of 10s. A hung provider used to stall verify ~2 minutes (past sshd’s LoginGraceTime); now a login falls back or fails in ~20s.

## Audit JSON format

We changed the JSON format slightly. If you have scripts that expect a particular json format, test and update them before switching to this release

## Changes

• feat：add safe persistent JWKS cache @gflex (#628)
• Make permissions --json emit only JSON and still fail @arpitjain099 (#646)
• feat(inspect)：discover opkssh certificates when no path is given @choksi2212 (#635)
• Speed up openssh version integration tests @EthanHeilman (#644)

## 🐛 Bug Fixes

• fix：Enable sshd\_session\_t when loading local SELinux policy files @EthanHeilman (#642)
• Fix log and installer bug before release v0.19.0 @EthanHeilman (#648)

## Dependencies

• fix(deps)：Update go toolchain directive to v1.27.2 @[renovate[bot]](https://github.com/apps/renovate) (#609)
• fix(deps)：Update opensuse/tumbleweed:latest Docker digest to 8732062 @[renovate[bot]](https://github.com/apps/renovate) (#639)