Feat: CODESYS Installatio cache for fast CI/CD jobs

[KevinRohn]

The main changes add new test workflows covering installer caching, version/architecture matrices, edge cases, and add-on installation scenarios.

Workflow additions and improvements:

• Added new GitHub workflows to test CODESYS installation across multiple scenarios:

  • Version/architecture matrix (test-install-versions.yml)
  • Installer-only setup (test-install-installer.yml)
  • Add-on installation from various sources (test-install-addons.yml)
  • Caching of installer and installation (test-install-cache.yml)
  • Edge cases including multiple installations, custom directories, and installer reuse (test-install-edge.yml) [1] [2] [3] [4] [5]

• Introduced a reusable composite GitHub Action (verify-codesys/action.yml) to verify that CODESYS starts successfully with the correct profile, used across all new workflows for robust validation.

Caching support:

• Added new input parameters to the main action (action.yml) for enabling caching of both the installer and the CODESYS installation, with corresponding output (cache-hit). Output paths now conditionally use cached values if available. [1] [2] [3]

Documentation updates:

• Updated README.md to:
  • Document the new caching options, including usage examples and input descriptions.
  • Add a badge for the version matrix workflow for improved visibility. [1] [2] [3]

These changes significantly improve test coverage, reliability, and performance of CODESYS installation workflows in CI/CD, and make it easier for users to leverage caching and validate installations.