Enable codeql

[Alan-Jowett]

This pull request introduces changes to the GitHub Actions workflow configuration in the .github/workflows/main.yml file. The changes involve the addition of four new jobs for CodeQL analysis on different build types and configurations.

The key changes are:

• Addition of new CodeQL analysis jobs:
  • linux_release_codeql: This job uses the posix.yml workflow to run a CodeQL analysis on a RelWithDebInfo build type on ubuntu-latest platform with x86_64 architecture.
  • linux_debug_codeql: Similar to the above job, but runs the CodeQL analysis on a Debug build type.
  • linux_release_no_retpolines_codeql: This job is similar to the linux_release_codeql job but with disable_retpolines set to true.
  • linux_debug_no_retpolines_codeql: This job is similar to the linux_debug_codeql job but with disable_retpolines set to true.

These changes enhance the security of the codebase by using CodeQL to automatically detect common vulnerabilities and coding errors.