Wrap int(timestamp) in try/except to return False instead of raising
ValueError on empty/invalid timestamp, which was causing a 500 error
instead of the intended 406.
Also add tests for empty timestamp (→ 406) and GET /inbound/email (→ 405).
Co-Authored-By: Paperclip <noreply@paperclip.ing>
Delete nested .github/workflows/ci.yml files from api/ and receiptwitness/
directories. These workflows were from the polyrepo era and reference the
deleted cartsnitch/common repo. They do not execute as GitHub Actions (not
at repo root) and are confusing.
No functional change — the monorepo CI is defined at .github/workflows/.
Co-Authored-By: Paperclip <noreply@paperclip.ing>