ci: add build pipeline, quality checks, and dependabot - #1

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: github/codeql-action/init@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Error retrieving diff master...pierrejochem:ci/build-pipeline-quality: Not Found - https://docs.github.com/rest/commits/commits#compare-two-commits

Cannot build an overlay database because build-mode is set to "manual" instead of "none". Falling back to creating a normal full database instead.