Repo health: modernize deps, security, tests, docs

[hippi345]

Summary

Modernization pass for this Azure Blob Storage CLI utility (Python 3.12+).

Security

• No committed secrets were found in the repository history in this review.
• Behavior change (security): the legacy script printed the storage account key to stdout; output now shows [redacted].
• Credentials can be supplied via AZURE_STORAGE_ACCOUNT_NAME, AZURE_STORAGE_ACCOUNT_KEY, or AZURE_STORAGE_CONNECTION_STRING (documented in README and .env.example).
• Added SECURITY.md, .gitignore (including .env), and Dependabot for pip and GitHub Actions.

Dependencies and runtime

• Requires Python 3.12+.
• Replaced deprecated azure.storage.blob.BlockBlobService with current azure-storage-blob (BlobServiceClient).
• Added pyproject.toml, requirements.txt, and requirements-lock.txt.

Working code / bug fixes

• -c containers are now honored (legacy code listed every container in the account).
• Fixed blob list accumulation across containers (incorrect totals).
• Removed incorrect get_blob_properties usage; sizes come from list results.
• Structured CLI with argparse while keeping python main.py entry point.

Tests and lint

• 7 offline unit tests (mocked storage; no Azure credentials).
• Ruff lint + format configuration in pyproject.toml.

CI

• GitHub Actions workflow: install, Ruff, build, pytest on push/PR (Python 3.12 and 3.13).

License

• Added MIT License, Copyright (c) 2026 Joel Shearon.

README

• Rewrote README with badges, setup, env vars, usage, tests, and project layout.

Polish

• .editorconfig, package layout under get_blobs_of_file_type/.

Owner actions

• If you ever ran the old version in a shared terminal or logs, rotate the storage account key as a precaution (old builds echoed the key).
• For local runs, set env vars or flags as documented; do not commit .env.

Verification (local)

ruff check .
ruff format --check .
pytest -v
python -m build