add .dockerignore to optimize and speed up Docker build

[TatjanaTrajkovic]

Summary
This PR adds a .dockerignore file to the root of the project. This ensures that only necessary source files are sent to the Docker daemon during builds.

Changes

• Added .dockerignore to exclude:
  • taget/ (local build artifacts)
  • .git/ (git history)
  • mvnw, mvnw.cmd, .mvn/ (not needed inside the container build)
  • other IDE-specific files

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/optimize-docker-build-context-by-adding-dockerignore

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[TatjanaTrajkovic]

@coderabbitai review

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[simonforsberg]

Nice follow-up to the Testcontainers PR, it makes sense after introducing Docker-based tests and will speed up builds.