Fix/dotfiles fish compatibility

[kourylape]

Description

The dotfiles module does not work when using non-POSIX shells i.e. Fish.

Type of Change

• New module
• New template
• Bug fix
• Feature/enhancement
• Documentation
• Other

Module Information

Path: registry/coder/modules/dotfiles
New version: v1.2.4
Breaking change: [ ] Yes [ ] No

Testing & Validation

• Tests pass (bun test)
• Code formatted (bun fmt)
• Changes tested locally

bun test v1.3.8 (b64edcb4)

registry/coder/modules/dotfiles/main.test.ts:
✓ dotfiles > required variables [190.40ms]
✓ dotfiles > missing variable: agent_id [43.12ms]
✓ dotfiles > default output [150.15ms]
✓ dotfiles > set a default dotfiles_uri [159.14ms]
✓ dotfiles > command uses bash for fish shell compatibility [164.08ms]
✓ dotfiles > set custom order for coder_parameter [166.50ms]

 6 pass
 0 fail
 7 expect() calls
Ran 6 tests across 1 file. [1184.00ms]

I tested this with a new workspace on Coder v2.27.3 with fish, zsh, and bash.

[chatgpt-codex-connector]

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Reviewed commit: d401399c9f

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[kourylape]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: d60546d4c4

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[DevelopmentCats]

I will go ahead and test this a bit and we can get this pushed.

Thank you for the PR! 😸