Dockerfile.bandit

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# Bandit SAST toolchain — pinned to Python 3.11 (Phase 323).
#
# Why not 3.14 (the rest of the tools image)?
#   Bandit's B502 (ssl_with_bad_version), B604 (shell=True) and B607
#   (start_process_with_partial_path) plugins still reference `ast.Num`, which
#   was REMOVED in Python 3.12. On 3.12+ they raise
#   "module 'ast' has no attribute 'Num'", and bandit then drops the whole
#   offending file into "Files skipped" — silently losing SAST coverage on
#   34 of 36 files under src/analytics + src/management. The gate stayed green
#   because bandit still exits 0.
#
#   Bandit only *parses* source (it never runs it), so running it on 3.11 —
#   where `ast.Num` still exists — restores full coverage without affecting
#   what ships (production/tests run on 3.14 via Dockerfile.tools). All bandit
#   1.7–1.8 releases crash on 3.14 and pass on 3.11, so this is a Python-version
#   fix, not a bandit-version one.
#
# ⚠ DO NOT BUMP THIS TAG. It is a deliberate pin, not staleness.
#   PR #340 ("build(deps): bump python from 3.11-slim to 3.14-slim") auto-bumped
#   it past this very comment and silently reintroduced the regression: on 3.14
#   the extension loader drops 6 plugins (B104-B108) and every file under
#   src/analytics raised "module 'ast' has no attribute 'Num'" — while bandit
#   still exited 0, so the gate stayed green with near-zero real coverage.
#   `tests/test_bandit_toolchain.py` now fails loudly if this is bumped again.
#   Unblocks removal: a bandit release whose plugins no longer touch `ast.Num`.
FROM python:3.11-slim

RUN useradd -r -u 1001 -s /bin/false bandit

WORKDIR /src

# pbr is bandit's build/runtime metadata dependency.
RUN pip install --no-cache-dir bandit==1.8.* pbr

HEALTHCHECK NONE

USER bandit