Update debugging docs, GitHub Actions and golangci config

[vishesh92]

This pull request updates the project's development tooling and documentation to improve compatibility, maintainability, and developer experience. The most significant changes are updates to GitHub Actions workflows and golangci-lint configuration, the addition of a lint target to the Makefile, and enhancements to the documentation for building and debugging.

CI/CD and Linting Improvements:

• Updated GitHub Actions workflows to use the latest versions of ubuntu-latest, actions/checkout@v6, and actions/setup-go@v6, and upgraded golangci-lint-action to v9 for improved reliability and support. (.github/workflows/build.yml, .github/workflows/build-docker-image.yml, .github/workflows/golangci-lint.yml) [1] [2] [3]
• Major overhaul of .golangci.yml: switched to version 2 config format, enabled/disabled specific linters, and added exclusions for generated code and certain paths for more precise linting. [1] [2]
• Added a lint target to the Makefile to run golangci-lint and gofmt, improving local code quality checks.

Documentation Updates:

• Updated the required Go version from 1.21 to 1.23 in README.md to reflect current build requirements.
• Improved example usage and added a new section on debugging with VSCode, including a sample launch.json configuration for easier local development.

Minor Code Quality Fixes:

• Standardized error message formatting in cloudstack_loadbalancer.go for consistency.

[Copilot]

Pull request overview

This pull request modernizes the project's development tooling and documentation by updating GitHub Actions workflows to latest versions, overhauling the golangci-lint configuration to v2 format, adding local linting capabilities via Makefile, and enhancing developer documentation with debugging instructions.

Key Changes:

• Updated GitHub Actions to use checkout@v6, setup-go@v6, and golangci-lint-action@v9 for better CI/CD reliability
• Migrated .golangci.yml to version 2 configuration format with refined linter selection
• Added VSCode debugging configuration and improved example usage in documentation

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
.github/workflows/build.yml	Updated to ubuntu-latest, checkout@v6, and setup-go@v6
.github/workflows/build-docker-image.yml	Updated to ubuntu-latest and checkout@v6
.github/workflows/golangci-lint.yml	Updated actions to v6 and golangci-lint-action to v9
.golangci.yml	Migrated to v2 config format with new linter settings and exclusions
Makefile	Added lint target for local code quality checks
README.md	Updated Go version requirement to 1.23 and added VSCode debugging section
cloudstack_loadbalancer.go	Standardized error messages to start with lowercase

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