chore(deps): update mirror.gcr.io/library/ubuntu docker tag to v26

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
mirror.gcr.io/library/ubuntu	final	major	24.04 → 26.04

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[gemini-code-assist]

Code Review

This pull request attempts to upgrade the base Docker image from Ubuntu 24.04 to Ubuntu 26.04. However, this upgrade is premature as Ubuntu 26.04 is not yet a stable LTS release, and third-party repositories configured in the Dockerfile do not yet support it, which will break the build.

[gemini-code-assist]

Upgrading to Ubuntu 26.04 is premature and will break the Docker build. Ubuntu 26.04 is not yet a stable/released LTS version, and critical third-party repositories configured in this Dockerfile (such as the Docker CE repository on line 77 and the Microsoft MSSQL repository on line 103) do not yet have packages or support for this version. This will cause apt-get update or package installation to fail. We should stick to the current LTS version (24.04) for now.

FROM mirror.gcr.io/library/ubuntu:24.04