feat: add .dockerignore file

[gentildpinto]

Description

The current Dockerfile does a copy all via COPY . . without any filtering on what is in the working directory. This pr adds a .dockerignore file to eliminate bloat

Fixes #69

Current status

• Waiting for review
• Waiting for comment resolution
• Waiting for merge
• Draft
• Trivial PR (nominal cosmetic/typo/whitespace changes)

Semantic Versioning

Please delete options that are not relevant. Ensure same has been covered in the commit message as well.

• This is a feat change

Type of change

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• New feature (non-breaking change which adds functionality)

Checklist:

• My commit message mentions fix, feat, BREAKING CHANGE accordingly to increase the semantic versioning
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have checked my code/docs and corrected any misspellings