This release fixes multiple security issues.

• [SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via /-/config endpoint. Thanks to @August829 and @Phaxma for reporting. GHSA-39j6-789q-qxvh #18650
• [SECURITY] Dependencies: Bump golang.org/x/net to v0.55.0 and OpenTelemetry to v1.43.0 to fix reported CVEs (GO-2026-5026, GO-2026-4918, GO-2026-4985). #18934
• [SECURITY] UI: Bump mantine-ui dependencies (react-router-dom, vitest, vite, postcss) to their patched versions to resolve security advisories. #18935
• [ENHANCEMENT] Release: Container images are now also published to the GitHub Container Registry (ghcr.io). #18792