Explicitly start postgres on azure

Seems to be necessary now...

Author: nikic

azure/job.yml

@@ -20,6 +20,7 @@ jobs:
     - script: |
         set -e
         sudo service mysql start
+        sudo service postgresql start
         mysql -uroot -proot -e "CREATE DATABASE IF NOT EXISTS test"
         sudo -u postgres psql -c "ALTER USER postgres PASSWORD 'postgres';"
         sudo -u postgres psql -c "CREATE DATABASE test;"