Adding Bazelisk/Bazel to the toolshed

[thirtytwobits]

No description provided.

[Copilot]

Pull request overview

Adds Bazel support to the ghcr.io/opencyphal/toolshed container by installing bazelisk as bazel, pre-warming a specific Bazel version into the image, and documenting the new toolchain contents in the repo’s release notes and tag summary table.

Changes:

• Add a new Dockerfile stage that installs bazelisk (as bazel) and pre-downloads Bazel 9.2.0 into a shared cache location.
• Document the new ts26.4.3 image contents and Bazel/bzlmod online-fetch behavior in the toolshed changelog.
• Update the top-level README tag matrix and example workflow snippet to reference ts26.4.3.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
toolshed/Dockerfile	Installs bazelisk as bazel, pre-warms Bazel 9.2.0, and adds smoke checks to validate basic Bazel execution/build.
toolshed/CHANGELOG.md	Adds ts26.4.3 release notes describing Bazel/bazelisk installation and expected network behavior.
toolshed/bazelisk-1.29.0-linux-arm64.sha256	Adds arm64 checksum for bazelisk release asset verification.
toolshed/bazelisk-1.29.0-linux-amd64.sha256	Adds amd64 checksum for bazelisk release asset verification.
README.md	Adds ts26.4.3 to the published tag matrix and updates the workflow example to the new tag.

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