Add GitHub Actions workflow for shell script linting and validation

[Copilot]

This PR adds automated shell script linting and validation to prevent invalid shell commands or syntax from being merged into the repository.

What's Added

A new GitHub Actions workflow (.github/workflows/shell-lint.yml) that automatically:

• Discovers all *.sh files in the repository using find
• Runs shellcheck for static analysis and best practice enforcement
• Validates syntax using bash -n to catch parsing errors
• Provides clear feedback with success/failure indicators

Workflow Triggers

The workflow runs efficiently on:

• Pull requests targeting main branch (only when .sh files are modified)
• Push to main branch (only when .sh files are modified)
• Manual workflow dispatch for testing purposes

Current Impact

The workflow currently detects existing issues in the repository:

autoupdate-dependencies.sh: 3 shellcheck warnings

• Missing quotes around variables that could cause word splitting (SC2086)

test/go/test.sh: 1 shellcheck error

• Missing shebang line (SC2148)

These issues will cause the workflow to fail until resolved, which is the intended behavior to prevent similar problems in future PRs.

Benefits

• 🛡️ Prevents invalid shell scripts from being merged
• 🔍 Catches common scripting mistakes early in development
• 📈 Enforces shell scripting best practices through shellcheck
• ⚡ Efficient execution with path-based filtering
• 🎯 No conflicts with existing workflows (uses unique triggers)

The workflow uses Ubuntu's pre-installed shellcheck and requires no additional dependencies, making it lightweight and reliable.

Original prompt

Add a GitHub Actions workflow to automatically lint and validate Shell scripts (such as autoupdate-dependencies.sh) in pull requests. This should prevent invalid shell commands or syntax from being merged. Use shellcheck for linting and bash -n for syntax validation. The workflow should trigger on pull requests and on push to main, and check all *.sh files in the repository.

*This pull request was created as a result of the following prompt from Copilot chat.* > Add a GitHub Actions workflow to automatically lint and validate Shell scripts (such as autoupdate-dependencies.sh) in pull requests. This should prevent invalid shell commands or syntax from being merged. Use shellcheck for linting and bash -n for syntax validation. The workflow should trigger on pull requests and on push to main, and check all *.sh files in the repository.

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