Update ubuntu Docker tag to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu	final	major	22.04 → 26.04

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Project	Deployment	Actions	Updated (UTC)
system-bridge	Ready	Preview, Comment	May 6, 2026 7:39pm

[timmo001]

@copilot review this PR. Note any packages and what versions they will bump from and to

[Copilot]

@copilot review this PR. Note any packages and what versions they will bump from and to

PR Review

This PR updates a single package in Dockerfile.ci-build-ubuntu:

File	Package	From	To
Dockerfile.ci-build-ubuntu	ubuntu (base image)	22.04 (sha256:962f6ca...)	26.04 (sha256:f3d2860...)

This is a major version bump, jumping directly from Ubuntu 22.04 (Jammy Jellyfish, April 2022 LTS) to Ubuntu 26.04 (April 2026 LTS), skipping Ubuntu 23.04, 23.10, 24.04 LTS, 24.10, 25.04, and 25.10.

⚠️ Concerns

1. libfuse2 availability: In Ubuntu 22.04 the package was named libfuse2. Starting with Ubuntu 22.04 updates and carried forward, it was renamed to libfuse2t64 (the t64 suffix for 64-bit time_t transition). On Ubuntu 26.04 the old libfuse2 package name may no longer exist, which would cause the apt-get install step to fail. Consider replacing libfuse2 with libfuse2t64 (or dropping it if AppImageTool bundles its own FUSE runtime).

2. Skipping two LTS releases: Jumping from 22.04 to 26.04 skips Ubuntu 24.04 LTS entirely. A more conservative, incremental upgrade to 24.04 first would reduce risk and make it easier to identify any breaking changes in APT packages, build tooling, or system libraries.

3. libgtk-3-dev and other GUI libs: These are present in both releases, but minor version bumps may introduce header/ABI differences worth testing in CI.

No other packages or versions are changed by this PR — GO_VERSION (1.25.9) and NODE_VERSION (24.15.0) remain the same.