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feat: add GitHub Action for automatic docs preview comments#20254
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This action automatically comments on pull requests with preview linkswhen documentation files in the docs/ directory are modified.Features:- Triggers on PR open, synchronize, and reopen events- Only runs when docs/ markdown files are changed- URI-encodes branch names properly (e.g., slashes become %2F)- Creates or updates a single comment with all changed doc links- Preview URLs follow format:https://coder.com/docs/@{encoded-branch}/{doc-path}Example: Branch 'df/claude-code-mod-v3' with changes to'docs/ai-coder/tasks-core-principles.md' will generate:https://coder.com/docs/@df%2Fclaude-code-mod-v3/ai-coder/tasks-core-principles
Use environment variables instead of direct template expansion in bashcommands to prevent potential code injection attacks through branch names.This addresses the zizmor linter check for template injection vulnerabilities.
- Add persist-credentials: false to checkout action to prevent credential leaks- Quote GITHUB_OUTPUT variable to fix shellcheck warningsAddresses artipacked and shellcheck findings from CI linter.
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Summary
This PR adds a GitHub Action that automatically comments on pull requests with preview links when documentation files in the
docs/directory are modified.Implementation Details
The action:
docs/are changeddf/claude-code-mod-v3→df%2Fclaude-code-mod-v3)https://coder.com/docs/@{encoded-branch}/{doc-path}Example
For a branch named
df/claude-code-mod-v3with changes todocs/ai-coder/tasks-core-principles.md, the action will comment:📚 Documentation Preview Links
The following documentation pages have been modified and are available for preview:
docs/ai-coder/tasks-core-principles.mdPreview links are generated for branch:
df/claude-code-mod-v3Testing
The workflow has been tested locally for:
Resolves
Addresses the request from@david-fraley to automatically comment preview links for documentation changes.