fix(ci): correct hashFiles syntax in docs.yml workflow conditional

[Copilot]

The documentation workflow was failing with a syntax error due to incorrect usage of the hashFiles function in a conditional expression.

Problem

The docs.yml workflow was producing the following error:

Invalid workflow file: .github/workflows/docs.yml#L1
(Line: 66, Col: 9): Unrecognized function: 'hashFiles'. Located at position 1 within expression: hashFiles('docs/conf.py') != ''

This prevented documentation builds from running on all pull requests, breaking the CI pipeline for documentation-related changes.

Root Cause

The issue was on line 66 where hashFiles was incorrectly wrapped with ${{ }} in an if condition:

if: ${{ hashFiles('docs/conf.py') != '' }}

In GitHub Actions, if conditions already expect expressions and should not be wrapped with ${{ }}. The hashFiles function works correctly in other contexts (like cache keys) but requires different syntax in conditional expressions.

Solution

Removed the ${{ }} wrapper to use the correct GitHub Actions syntax:

if: hashFiles('docs/conf.py') != ''

This follows GitHub Actions best practices where conditional expressions are evaluated directly without the expression wrapper.

Validation

• ✅ YAML syntax remains valid
• ✅ The target file docs/conf.py exists (3885 bytes)
• ✅ Logic is correct: returns true when the file exists, false otherwise
• ✅ Minimal surgical change following repository guidelines

This fix ensures that Sphinx documentation builds will run properly when docs/conf.py is present, which it currently is.

Fixes #17.

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