Adds support for .upmconfig.toml in Windows Docker images

[lupidan]

Changes

• Similarly to what it does for Linux, Windows now creates a _github_home folder in the runner's temp folder if it does not exist.
• Updates Windows Docker model to mount the _github_home from the temp folder into C:\githubhome, to align with the current documentation that works on macoOS and ubuntu.
• Updates Windows entrypoint.ps1 to check if a .upmconfig.toml is available in C:\githubhome, and copies it into current user's home folder, so Unity can see it.

Checklist

• Read the contribution guide and accept the
  code of conduct

Summary by CodeRabbit

• New Features
  • Added support for mounting a new directory as a volume in Windows Docker containers, mapping a host directory to C:/githubhome inside the container.

[coderabbitai]

📝 Walkthrough

Walkthrough

The update modifies the Windows Docker command generation logic to add a volume mount for a _github_home directory within the runner's temporary path. Before constructing the Docker command, it ensures the directory exists, and then mounts it into the container at C:/githubhome. No other command parameters or exported interfaces are changed.

Changes

File(s)	Change Summary
src/model/docker.ts	Updated Windows Docker command generation to add a _github_home volume mount; ensures directory exists before command construction.

Poem

In the world of Docker, a new path is shown,
_github_home is mounted, its purpose now known.
Windows commands updated, the temp path checked,
Into C:/githubhome, the directory is decked.
With volumes aligned, the containers will roam—
A rabbit’s delight in its new Docker home! 🐇🪄

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 81ed299 and d4e973c.

⛔ Files ignored due to path filters (3)

• dist/index.js is excluded by !**/dist/**
• dist/index.js.map is excluded by !**/dist/**, !**/*.map
• dist/platforms/windows/entrypoint.ps1 is excluded by !**/dist/**

📒 Files selected for processing (1)

• src/model/docker.ts (1 hunks)

🧰 Additional context used

🧬 Code Graph Analysis (1)

src/model/docker.ts (2)

src/model/input.ts (3)

• runnerTempPath (114-116)
• dockerWorkspacePath (240-242)
• gitPrivateToken (202-204)

src/model/action.ts (1)

• workspace (36-38)

🔇 Additional comments (3)

src/model/docker.ts (3)

91-101: LGTM: Appropriate parameter extraction

The code now correctly extracts runnerTempPath from parameters to use for GitHub home directory setup on Windows, aligning with the Linux implementation.

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103-105: Good implementation of GitHub home directory creation

This change creates a _github_home directory within the runner's temporary path for Windows, mirroring the existing implementation for Linux environments (lines 54-55). This is essential for supporting the .upmconfig.toml file for UPM authentication as mentioned in the PR objectives.

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113-113: Excellent Windows volume mapping implementation

The volume mapping from the host's _github_home directory to C:/githubhome inside the Windows container completes the implementation. This aligns with the PR's objective to support .upmconfig.toml in Windows Docker images and creates consistency with the Linux implementation (which maps to /root at line 68).

According to the PR description, the entrypoint.ps1 script (referenced at line 127) will handle copying any .upmconfig.toml file from this location to the user's home directory where Unity can access it.

✨ Finishing Touches

• 📝 Generate Docstrings

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