add CI infrastructure for fiadb unit tests

[hrodmn]

Will look something like this:

curl https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/apt.postgresql.org.gpg >/dev/null
sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'

apt update && apt install -y postgresql-12 pgloader postgis postgresql-12-postgis-3
# spin up local postgresql database
sudo service postgresql start
sudo -u postgres psql -c "DROP DATABASE IF EXISTS testfiadb;"
sudo -u postgres createdb testfiadb
sudo -u postgres psql -c "ALTER USER postgres PASSWORD 'password';"
sudo -u postgres psql -d testfiadb -c "CREATE EXTENSION postgis; CREATE EXTENSION postgis_topology;"
cd $GITHUB_WORKSPACE/fiadb
pytest