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 change will break the Docker build due to several critical incompatibilities, such as the removal of the deprecated apt-key utility, dependency issues with the Microsoft ODBC repository, and Python compilation failures. It is recommended to revert this change and remain on Ubuntu 24.04.

[gemini-code-assist]

Upgrading the base image to Ubuntu 26.04 (resolute) will completely break the Docker build due to several critical incompatibilities:

1. Removal of apt-key: Ubuntu 26.04 (which ships with APT 3.1) has completely removed the deprecated apt-key utility. The Dockerfile contains multiple legacy commands using apt-key add (e.g., lines 74, 102, and 252). These will fail immediately with apt-key: command not found (exit code 127). These must be migrated to modern GPG keyrings (e.g., downloading keys to /etc/apt/keyrings/ and using the signed-by option in the sources list).
2. Incompatible Microsoft ODBC Repository: Line 103 pulls the package list for Ubuntu 20.04 (https://packages.microsoft.com/config/ubuntu/20.04/prod.list). Installing msodbcsql17 from the 20.04 repository on Ubuntu 26.04 will fail due to missing legacy dependencies (such as libssl1.1).
3. Python Compilation Failures: Compiling older Python versions (specifically 3.7, 3.8, and 3.9) from source on Ubuntu 26.04 will fail because OpenSSL 1.1.1 is no longer available (replaced entirely by OpenSSL 3.x) and newer compiler toolchains (GCC 15+) enforce stricter standards.
4. Rust Coreutils: Ubuntu 26.04 defaults to Rust-based uutils coreutils instead of GNU Coreutils, which can introduce subtle behavioral differences in existing shell scripts.

It is recommended to revert this change and keep the base image on Ubuntu 24.04 LTS until the Dockerfile is thoroughly refactored to support Ubuntu 26.04.

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