Update .dockerignore

[ineiti]

Pull Request Template

Summary

Simplifying exclude patterns. Some of the previous patterns were doubled, e.g., it is not necessary
to exclude both .* and .git.

Change Type

Please delete any irrelevant options.

• Bug fix (non-breaking change which fixes an issue)

Testing

Tested it on my instance

Test Configuration:

Test with docker-compose.override.yaml and docker-compose build.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules.