Add docker setup

[BytecodeBrewer]

What changed?

• add dockerfile
• add .dockerirgnore
• update readme

Related issue

Closes #41

Tests

• I ran pytest
• Existing tests pass
• I added or updated tests where necessary
• Not needed because this only affects documentation or repository setup

Checklist

• The change is focused
• No secrets or API keys are included
• Documentation was updated if needed
• CI is expected to pass

Notes

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Rename the Dockerfile to match Docker defaults

With the build file committed as lowercase dockerfile, the documented docker build -t argus . command here will not find it on case-sensitive filesystems such as Linux CI; Docker's default build path is a file literally named Dockerfile unless -f is supplied. Rename the file to Dockerfile or change this command to docker build -f dockerfile -t argus . so the new Docker setup works as documented.

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