Add GitHub Copilot instructions for repository

[Copilot]

Adds .github/copilot-instructions.md to provide Copilot with repository-specific context per GitHub best practices.

Content

• Build system: Concatenation-based workflow via build.sh, source file ordering, version injection
• Code style: Prettier config (tabs, single quotes, no bracket spacing), comment removal patterns
• Testing: Mocha with test###.js naming convention, --bail behavior
• Development workflow: yarn commands, format-before-commit requirement, branch strategy
• Parser modifications: Jison grammar regeneration from .jison to .js
• Generated files: dist/, alasqlparser.js, .min.js (not to be manually edited)

Enables Copilot to understand AlaSQL's unique build process where source files in src/ are numbered to control concatenation order, and browser/Node.js variants are created with different code paths.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• gh.io
  • Triggering command: curl -s REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ✨ Set up Copilot instructions #2182

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.