Add Git Clone and Pip Install group directives with revision/tag and conda environment support

[Copilot]

This PR implements two new group directives that wrap common container building patterns, as requested in issue #49.

Git Clone Group Directive

Provides a streamlined interface for cloning git repositories with advanced options:

• Repository URL: Supports both HTTPS and SSH URLs
• Revision/tag support: Specify branches, tags, or commit hashes to checkout specific versions
• Recursive cloning: Include git submodules when needed
• Cleanup option: Remove .git directory after cloning to reduce image size
• Flexible destination paths: Configure where the repository is cloned

Generated Neurodocker commands:

git clone [--recursive] "https://github.com/user/repo.git" "/opt/repository"
cd "/opt/repository" && git checkout "v1.2.3"  # when revision specified
rm -rf "/opt/repository/.git"  # when cleanup enabled

Pip Install Group Directive

Provides enhanced Python package installation with conda environment integration:

• Conda environment support: Install packages into specific conda environments using conda run -n <env>
• Multiline package specification: One package per line with version support (e.g., numpy==1.21.0)
• Advanced PyPI configuration: Custom index URLs for private repositories
• Configurable pip options: Additional flags like --no-cache-dir
• Automatic pip upgrade: Option to upgrade pip before installation

Generated Neurodocker commands:

conda run -n myenv python -m pip install --upgrade pip
conda run -n myenv python -m pip install --no-cache-dir numpy scipy matplotlib

Implementation Details

Both directives follow the established group directive pattern:

• Comprehensive form interfaces with validation
• Help documentation with usage examples
• Advanced settings sections for power users
• Real-time parameter updates
• Consistent UI styling and behavior

Screenshots

The new directives are fully integrated into the directive selector:

Both directives provide intuitive configuration interfaces with all the requested features:

These directives address common containerization workflows and make it easier to build containers that clone source code at specific versions and install Python packages into conda environments.

Fixes #49.

Warning

Firewall rules blocked me from connecting to one or more addresses

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

• fonts.googleapis.com
  • Triggering command: next-server (v15.3.3) (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)

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