These are useful to spot failures.

Also, run tests before building the container image.

Run our own little SMTP server, attempt to parse all incoming
messages. Currently only DMARC email support is implemented (both ZIP
and gzip formats).

These originate from "report-uri" (not "report-to") tags in CSP
headers, and appear as application/csp-report requests.

Also, stop logging the client IP for email reports, where it's just
going to be some email provider's reporting infrastructure.