Primary Deployment Steps:
- halt all importers on prod1
- take full private database snapshot (version used for upgrades)
- merge branch to master
- git pull
- run diesel SQL migration: time diesel migration run
- cargo build: time cargo build --release
- restart fatcat-api
- pipenv update: time pipenv install --dev --deploy
- restart fatcat-web
- restart importers

Commands and status:

    sudo systemctl stop fatcat-import-*

    # expecting ~3 hours for dump to complete on fatcat-prod1
    export DATESLUG="`date +%Y-%m-%d.%H%M%S`"
    time sudo -u postgres pg_dump --verbose --format=tar fatcat_prod | pigz > /srv/fatcat/snapshots/fatcat_full_dbdump_${DATESLUG}.tar.gz

    real    176m4.992s
    user    729m44.161s
    sys     56m41.694s

    fatcat@wbgrp-svc502:/srv/fatcat/src/rust$ time diesel migration run
    Running migration 2021-10-12-215817_v0.4

    real    0m1.518s
    user    0m0.054s
    sys     0m0.024s


    fatcat@wbgrp-svc502:/srv/fatcat/src/rust$ time cargo build --release
       Compiling fatcat-openapi v0.4.0 (/srv/fatcat/src/rust/fatcat-openapi)
       Compiling fatcat v0.4.0 (/srv/fatcat/src/rust)
        Building [=====================================================> ] 353/354: fatcatd(bin)                                                                
        Finished release [optimized] target(s) in 3m 13s

    real    3m13.627s
    user    8m28.880s
    sys     0m12.591s

Cleanup:
- deploy to other nodes, following same re-compile / pipenv steps
- update CHANGELOG date, this file, tag a release, and push
- push pipy package update (need account recovery!)
- merge fatcat-cli changes, push a release