Add devcontainer

[mlinksva]

No description provided.

[Copilot]

Pull request overview

This PR adds VS Code devcontainer configuration to enable containerized development environments for the choosealicense.com project. The devcontainer setup dynamically fetches the correct Ruby version from GitHub Pages and sets up the development environment using RVM. Additionally, the PR updates license example projects in the GPL license files.

Changes:

• Added devcontainer configuration with automated setup script
• Replaced GIMP with uBlock Origin as GPL-3.0 example
• Replaced AliSQL with OBS Studio as GPL-2.0 example

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
.devcontainer/devcontainer.json	Basic devcontainer configuration defining project name and post-create command
.devcontainer/post-create.sh	Setup script that fetches Ruby version, initializes submodules, installs Ruby via RVM, and runs bundle install
_licenses/gpl-3.0.txt	Updated project example from GIMP to uBlock Origin
_licenses/gpl-2.0.txt	Updated project example from AliSQL to OBS Studio

Comments suppressed due to low confidence (1)

.devcontainer/post-create.sh:16

• The script downloads and executes code from an external URL (https://pages.github.com/versions.json) without any verification of the response integrity. While GitHub Pages is generally trustworthy, consider adding checksum verification or at minimum validating that the returned data structure matches expectations before using it in critical operations like RVM installation.

pages_ruby_version="$({
  curl -fsSL https://pages.github.com/versions.json
} | ruby -rjson -e 'print JSON.parse(STDIN.read).fetch("ruby")')"

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