staging/webapp: Deploy new production_db configuration

Staging first, the production should not be long to follow.

Note that I took a shortcut, I removed the creation of the dir and file used for the previous sqlite db. Those are already created in our current instance and won't be cleaned up so this should be fine (that should pose pb if we ever created a new node which won't do right now)

Plus, recent backups were done.

Related to T2945

Test Plan

octocatalog:

bin/octocatalog-diff --octocatalog-diff-args --no-truncate-details --to staging webapp.internal.staging.swh.network
Found host webapp.internal.staging.swh.network
*** Running octocatalog-diff on host webapp.internal.staging.swh.network
I, [2021-04-01T17:09:10.964511 #1471]  INFO -- : Catalogs compiled for webapp.internal.staging.swh.network
I, [2021-04-01T17:09:12.347255 #1471]  INFO -- : Diffs computed for webapp.internal.staging.swh.network
diff origin/production/webapp.internal.staging.swh.network current/webapp.internal.staging.swh.network
*******************************************
  File[/etc/softwareheritage/web/web.yml] =>
   parameters =>
     content =>
      @@ -58,5 +58,10 @@
             - 192.168.100.0/23
             - 129.168.130.0/24
      -production_db: "/var/lib/swh/web.sqlite3"
      +production_db:
      +  host: db1.internal.staging.swh.network
      +  port: 5432
      +  name: swh-web
      +  user: swh-web
      +  password: swh-deploy-webapp-db-password
       es_workers_index_url: http://search-esnode0.internal.staging.swh.network:9200/swh_workers-*
       deposit:
*******************************************
- File[/var/lib/swh/web.sqlite3]
*******************************************
- File[/var/lib/swh]
*******************************************
*** End octocatalog-diff on webapp.internal.staging.swh.network

It shows teeth but it won't bite (it won't actually do anything to the file it claims to remove)

bin/octocatalog-diff --octocatalog-diff-args --no-truncate-details --to staging moma
*** Running octocatalog-diff on host moma.softwareheritage.org
I, [2021-04-01T17:16:25.210962 #27635]  INFO -- : Catalogs compiled for moma.softwareheritage.org
I, [2021-04-01T17:16:28.189355 #27635]  INFO -- : Diffs computed for moma.softwareheritage.org
diff origin/production/moma.softwareheritage.org current/moma.softwareheritage.org
*******************************************
- File[/var/lib/swh/web.sqlite3]
*******************************************
- File[/var/lib/swh]
*******************************************
*** End octocatalog-diff on moma.softwareheritage.org

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Migrated from D5402 (view on Phabricator)