db: recreate post versions and pool versions tables.

Add the post and pool versions tables back. Currently only used by the
test suite to make it easier to run. Not yet used for production.

.github/workflows/test.yaml

@@ -92,15 +92,6 @@ jobs:
         cd /danbooru
         bin/rails db:test:prepare
 
-        apt-get update
-        apt-get -y install --no-install-recommends ruby-dev postgresql-server-dev-all build-essential zlib1g-dev git
-        mkdir ~/archives
-        cd ~/archives
-        git clone https://github.com/evazion/archives .
-        gem install bundler -v 1.13.3
-        bundle install --binstubs
-        bin/rake db:migrate
-
     - name: Run tests
       run: |
         export HOME=/root