Add automatic PR validation workflow integrated with Zola deployment

[Copilot]

This PR adds automatic build validation for pull requests to prevent website deployment failures by integrating PR validation directly into the existing Zola deployment workflow.

Problem

Currently, PRs are not validated to ensure the website will render correctly, which can result in deployment failures when changes are merged to the main branch.

Solution

Enhanced the existing zola-deploy.yml workflow to handle both PR validation and production deployment:

• Triggers on pull requests: Added pull_request trigger targeting the main branch for validation
• Conditional deployment: Uses if: github.event_name != 'pull_request' to skip deployment steps for PRs
• Smart checkout: Automatically checks out PR branch for pull requests or main branch for deployments
• Unified build logic: Both PR validation and deployment use identical build processes

Benefits

• Prevents deployment failures: Catches build issues before they reach production
• Immediate feedback: Contributors get build validation results directly in their PRs
• Consistent validation: Uses identical build logic as production deployment
• Reduced maintenance: Single workflow file eliminates code duplication
• Minimal implementation: Enhanced existing workflow instead of adding separate files

The workflow validates:

• TOML configuration syntax errors
• Missing or broken content files
• Template rendering problems
• Sass compilation issues
• Any other build-time errors

This ensures that only PRs with valid, buildable changes can be merged, significantly reducing the risk of deployment failures while maintaining a clean, consolidated workflow structure.

Fixes #324.

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[madolson]

Can you merge this workflow with deploy-zola.yaml

[Copilot]

Can you merge this workflow with deploy-zola.yaml

Merged the PR validation workflow into the existing zola-deploy.yml workflow as requested. The consolidated workflow now handles both PR validation and deployment using conditional logic:

• PR validation: Triggers on pull_request to main, builds only (no deployment)
• Deployment: Triggers on push to main, builds + deploys to GitHub Pages

This eliminates code duplication while maintaining identical build logic for both scenarios. Commit: 3f05b96