Add devcontainer configuration excluding rJava

[google-labs-jules]

This PR adds a .devcontainer configuration to the project. It sets up a development environment based on mcr.microsoft.com/devcontainers/r:latest.

Key features:

1. Java-Free Environment: The container is configured to start without Java. The dependency installation script (.devcontainer/setup.R) reads DESCRIPTION and installs all dependencies except rJava. This allows testing the package's functionality for downloading and installing Java.
2. Tooling:
   • Installs Posit Air CLI for code formatting.
   • Installs VS Code extensions: Posit.air-vscode and quarto.quarto.
3. Automation: The postCreateCommand runs a setup script that installs the Air CLI and the R dependencies.

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PR created automatically by Jules for task 15392296075773728410 started by @e-kotov

[google-labs-jules]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.79%. Comparing base (cbc4a78) to head (82b279e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   86.80%   88.79%   +1.98%     
==========================================
  Files          20       27       +7     
  Lines        1993     2819     +826     
==========================================
+ Hits         1730     2503     +773     
- Misses        263      316      +53     

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[Copilot]

Pull request overview

This PR adds a devcontainer configuration to facilitate development and testing of the rJavaEnv package in an environment without Java pre-installed. This is valuable for testing the package's core functionality of downloading and installing Java.

Changes:

• Added devcontainer configuration using Microsoft's R devcontainer base image
• Created setup scripts to install Posit Air CLI and R dependencies while explicitly excluding rJava
• Configured VS Code extensions for R, Quarto, and Posit Air development

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
.devcontainer/devcontainer.json	Defines the devcontainer configuration with base image, VS Code extensions, and post-create command
.devcontainer/setup.sh	Bash script that installs Posit Air CLI and executes R dependency setup
.devcontainer/setup.R	R script that reads DESCRIPTION and installs all dependencies except rJava

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