Automatically run setup steps based on environment kinds and add release workflow

[petebachant]

Calkit projects can basically run with just a checkout and this action.

Resolves #10

[Copilot]

Pull request overview

This PR updates the composite GitHub Action to automatically detect environment “kinds” from calkit.yaml and run the appropriate toolchain setup steps (e.g., uv/Calkit, Python, Conda, Pixi, Julia, R, MATLAB, Docker Buildx) before executing the Calkit pipeline, simplifying user workflows.

Changes:

• Added a “Detect setup requirements” step and conditional setup steps in action.yml based on detected environment kinds and tool availability.
• Simplified the example workflow by removing explicit uv/Calkit install steps, relying on the action to perform setup.
• Updated README copy to describe the new automatic setup behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
README.md	Updates usage docs to describe automatic environment-based setup and simplifies the example workflow snippet.
example.yml	Removes explicit uv/Calkit install steps in the example workflow to match the new action behavior.
action.yml	Implements environment-kind detection plus conditional tool setup steps before running Calkit/DVC operations.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.