test: Add container job test case for #107

[hustcer]

Cover the regression fixed in dfde332: ${{ github.action_path }} points to a host path that does not exist inside container jobs, so the action must resolve files via $env.GITHUB_ACTION_PATH.

[github-actions]

Script Analysis

• This is a GitHub Actions workflow addition, not a Nushell script
• The change adds a container-based CI job for regression testing
• No Nushell code, structured data handling, or pipeline operations present
• The workflow uses standard GitHub Actions syntax and bash commands

Security Review

• No command injection risks in the static workflow definition
• No data leakage concerns as this is a CI configuration
• External command usage (moon version --all) is static and controlled
• No permission validation issues in the workflow structure

Optimization Suggestions

• N/A - This is a CI workflow configuration, not a Nushell script
• No pipeline operations to optimize
• No memory usage patterns to analyze
• No parallel execution opportunities within the workflow itself

Overall Quality: N/A (Not a Nushell script - this is a GitHub Actions workflow YAML file. The review criteria for Nu 0.108+ compatibility, structured data handling, pipeline efficiency, and module organization do not apply to this type of configuration file.)