Install p7zip (Unix command-line port of 7-Zip)

It is used for extracting opendrr-boundaries-db.7z.*
from OpenDRR/boundaries-db for OpenDRR/opendrr-api starting v1.4.4.

TODO: Replace with the newer "7zip" package when it becomes available
      in newer Debian releases or backports.

Author: anthonyfok

Dockerfile

@@ -51,6 +51,7 @@ Pin-Priority: 50' > /etc/apt/preferences.d/git-in-bullseye \
        jq \
        moreutils \
        nano \
+       p7zip \
        postgresql-client \
        pv \
        pypy3 \