Add .gitignore templates to extension language scaffolding

[Copilot]

When running azd x init, generated extension projects lacked .gitignore files, requiring manual creation for each new extension.

Changes

Added language-specific .gitignore templates to extension scaffolding directories:

• Go: bin/ directory and standard Go patterns (already existed, updated to explicitly list bin/)
• Python: bin/, build/, generated_proto/, virtual environments, bytecode
• JavaScript: bin/, generated/, node_modules/
• C#: bin/, obj/, Visual Studio user files

Templates are automatically copied during azd x init via existing copyAndProcessTemplates logic in init.go. No code changes required.

Example: After running azd x init --language python, the generated project now includes:

# Build output directory
bin/

# PyInstaller build artifacts
build/
dist/

# Generated protobuf files
generated_proto/

# Node modules
node_modules/
...

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:

• aka.ms
  • Triggering command: /home/REDACTED/work/azure-dev/azure-dev/cli/azd/azd x init --no-prompt --id test.extension --name Test Extension --capabilities custom-commands --language python (dns block)
  • Triggering command: ./azd ext --help (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>[extension] azd x init should generate a .gitignore with sensible defaults to improve dev experience</issue_title>
<issue_description>When initializing a new extension, some folders should be ignored by Git. Generating the .gitignore file would save the extension developer some time and improve the experience.

Something like this:

Go

bin/

Python

bin/
build/
generated_proto/

Javascript

bin/
generated/
node_modules/

C Sharp

bin/
obj/

</issue_description>

<agent_instructions>Update the azd x init command in the developer extension to include a per language .gitignore file that gets added to the project output along with each generated sample project.</agent_instructions>

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

• Fixes [extension] azd x init should generate a .gitignore with sensible defaults to improve dev experience #5717

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