Fix GitHub Actions workflow to respect minimum Node.js version selection and centralize version fallbacks

[Copilot]

The GitHub Actions workflow template was incorrectly using hardcoded Node.js test versions, causing CI failures when adapters were created with Node.js 20+ as the minimum version. The workflow would still attempt to run tests on Node.js 18.x, leading to npm engine compatibility errors:

npm error code EBADENGINE
npm error engine Unsupported engine
npm error engine Not compatible with your version of node/npm: iobroker.typescript-demo@0.0.1
npm error notsup Not compatible with your version of node/npm: iobroker.typescript-demo@0.0.1
npm error notsup Required: {"node":">= 20"}
npm error notsup Actual:   {"npm":"10.8.2","node":"v18.20.8"}

Changes Made

Dynamic Node.js Version Filtering

Updated templates/_github/workflows/test-and-release.yml.ts to dynamically filter Node.js versions based on the user's minimum version selection:

Before:

const ltsNodeVersion = "20.x";
const adapterTestVersions = ["20.x", "22.x", "24.x"]; // Hardcoded

After:

// Determine the LTS version and test versions based on the minimum Node.js version selected
const minNodeVersion = answers.nodeVersion || RECOMMENDED_NODE_VERSION_FALLBACK;
const ltsNodeVersion = `${minNodeVersion}.x`;

// Filter test versions to only include versions >= the minimum version
const allTestVersions = ["20.x", "22.x", "24.x"];
const minVersionNumber = parseInt(minNodeVersion, 10);
const adapterTestVersions = allTestVersions.filter(version => {
    const versionNumber = parseInt(version.split('.')[0], 10);
    return versionNumber >= minVersionNumber;
});

Centralized Version Fallbacks

Created src/lib/constants.ts to centralize fallback values and eliminate code duplication. Updated three template files that were using hardcoded Node.js version fallbacks:

• templates/_github/workflows/test-and-release.yml.ts
• templates/package.json.ts
• templates/tsconfig.json.ts

All now import and use the RECOMMENDED_NODE_VERSION_FALLBACK constant, making future updates easier to maintain.

Results

Now when creating adapters with different minimum Node.js versions:

• Node.js 20: Tests against [20.x, 22.x, 24.x], uses 20.x for LTS operations
• Node.js 22: Tests against [22.x, 24.x], uses 22.x for LTS operations
• Node.js 24: Tests against [24.x], uses 24.x for LTS operations

This ensures CI pipelines only test against compatible Node.js versions, eliminating the engine compatibility failures while improving code maintainability.

Testing

Added comprehensive test coverage to prevent regressions, validating that the workflow correctly filters Node.js versions for all supported minimum versions (20, 22, 24).

Fixes #1144.

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[Apollon77]

please add a constant for the "recommended nodejs fall back version" in a new file for such fallbacks (are there more such fallbacks in the code?) and import from there

[Apollon77]

@copilot please add a constant for the "recommended nodejs fall back version" in a new file for such fallbacks (are there more such fallbacks in the code?) and import from there

[Copilot]

Added a new constants file src/lib/constants.ts with RECOMMENDED_NODE_VERSION_FALLBACK constant. Found and updated three locations where "20" was used as a Node.js version fallback:

• templates/_github/workflows/test-and-release.yml.ts
• templates/package.json.ts
• templates/tsconfig.json.ts

All now import and use the centralized constant. Commit fb9ad97.