feat(build): add Matomo tracking params validation in build script

[DeckerSU]

Updated the build script to handle Matomo tracking configuration:

• Requires MATOMO_URL and MATOMO_SITE_ID environment variables.
• Injects both values into BUILD_CMD via --dart-define when present.
• Show a warning message if one or both parameters are missing.

This ensures builds only proceed when Matomo tracking is properly configured.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch patch-add-matomo-docker

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[github-actions]

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