feat: add Docker support; update CI/CD, docs, and bootstrap

[Pymetheus]

Description

Introduce a docker/ directory (multi-stage Dockerfile and docker-compose.yml) and wire containerization into CI/CD and docs. Update GitHub Actions: bootstrap.yml updates package/distribution placeholders and yq version; ci.yml adds a build-docker job and a container smoke test; cd.yml adds attestations permission and includes a commented publish-docker job for GHCR. Adjust .dockerignore to exclude docker context and add repository metadata files. Revise README and docs/ to document containerization, CI/CD changes, and checklist items. Small runtime change: disable writing logs to disk in src package_name/main.py (setup_logging write_to_disk=False).

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test addition or update

Related Issue

no issue

Changes Made

• Introduce a docker/ directory (multi-stage Dockerfile and docker-compose.yml)
• Update GitHub Actions with build-docker job and push to GHCR
• Revise README and docs/ to document containerization, CI/CD changes, and checklist items.

Testing

Describe how you tested your changes:

• Unit tests pass
• Integration tests pass
• Manual testing performed

Screenshots (if applicable)

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Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Context

Add any other context about the PR here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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