staging: Deploy swh-scrubber database and checkers

Plan:

• infra/puppet/puppet-swh-site!501: Install scrubber (postgres) db

• Check connection is ok

• D7500: Update documentation on how to connect to db

• Prepare git repository for debian package [1]

• Debian package bootstrap

• Fix debian build papercuts

  • Fix stuck python3-swh.graph.client build failure [2]
  • Fix python3-swh.scrubber (failing due to ^)

• #4102 (closed): Install schema in swh-scrubber db

• #4102 (closed): Grand read-only access to guest user

• infra/puppet/puppet-swh-site!502, infra/swh-sysadmin-provisioning!68: Deploy postgres checker service on a dedicated scrubber node

• [1]

# First install the 'has-debian-packaging-branch' flag in repository in
# https://forge.softwareheritage.org/diffusion/edit/254/page/basics/
# Then install git pre-receive hook for ci to trigger the debian package build out of a git tag
root@tate:/srv/phabricator/hooks# phabricator-setup-hook /srv/phabricator/repos/254/ post-receive-swh-modules
Hook post-receive-swh-modules successfully installed on /srv/phabricator/repos/254/:

• [2] https://jenkins.softwareheritage.org/job/debian/job/packages/job/DGRPH/job/gbp-buildpackage/ back to green!

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Migrated from T4102 (view on Phabricator)