ci: improve docker build and push phase

replace docker-build and deploy shell tasks by a custom NX executor or a lib

No files are named in the issue, so start by inspecting CI workflow and Nx config files to locate the `docker-build` and `deploy` shell tasks. Follow those task definitions to identify where build/push inputs, secrets, and command chains are wired. Next, replace the shell-based flow with a custom Nx executor or shared library hook and wire it into the same targets. Finish when the CI path runs successfully with the same Docker build/push behavior but without direct shell-task steps.

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