feat: add GitHub Action for automatic docs preview comments #20254
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This action automatically comments on pull requests with preview links when 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
david-fraley
changed the title
Use environment variables instead of direct template expansion in bash commands 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 warnings Addresses 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.