Add: max-parallel: 1 for language matrix jobs

[AR21SM]

Description

Changes Made

Matrix Job Concurrency Control:

• Added max-parallel: 1 constraint to the language matrix strategy in deploy-book job
• Forces sequential execution of language builds instead of parallel processing
• Applies to all language variants processed through the matrix configuration

Technical Rationale

Problem: Parallel language matrix jobs can cause deployment conflicts when multiple builds attempt to write to GitHub Pages simultaneously, potentially leading to:

• Race conditions during deployment
• Incomplete or corrupted deployments
• Build failures due to concurrent write operations ( see )

Solution: Sequential job execution prevents concurrent write conflicts.

Implementation Details

Before:

strategy:
  matrix:
    language: ${{ fromJSON(needs.get-info.outputs.languages) }}

After:

strategy:
  max-parallel: 1
  matrix:
    language: ${{ fromJSON(needs.get-info.outputs.languages) }}

Impact

Performance Trade-off:

• Total deployment duration will increase proportionally to the number of supported languages
• Eliminates deployment race conditions and ensures consistent site state

Deployment Stability:

• Guarantees sequential language deployment to respective subdirectories
• Prevents GitHub Pages service conflicts during multi-language publishing

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