fix(sandbox): pin Debian security suite to avoid stale libssh2 - #298
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The sandbox image (node:22-bookworm-slim) shipped libssh2-1 1.10.0-3+b1, failing the Trivy CRITICAL/HIGH gate with CVE-2026-7598 / CVE-2026-58050. The base image's snapshot-pinned debian.sources lags the security suite, so the cached apt layer kept serving the vulnerable package even after DSA-6365-1 published 1.10.0-3+deb12u1.
Configure Debian sources explicitly (bookworm + bookworm-security) in the Dockerfile so every build pulls current security fixes and never serves a stale cached apt layer.
Verified locally:
trivy image --severity CRITICAL,HIGH --ignore-unfixed --vuln-type os --exit-code 1on the rebuilt image reports 0 vulnerabilities.