Provide the DATABASE_URL env var in CI

.github/workflows/ci.yml

@@ -7,6 +7,8 @@ on:
       - master
 env:
   RAILS_ENV: test
+  DATABASE_URL: postgres://postgres:postgres@localhost:5432/postgres
+
 jobs:
   test:
     name: "Test"

config/database.yml

@@ -1,18 +1,18 @@
+---
 default: &default
   adapter: postgresql
-  encoding: utf8
+  encoding: unicode
   min_messages: warning
   pool: <%= Integer(ENV.fetch("DB_POOL", 5)) %>
-  reaping_frequency: <%= Integer(ENV.fetch("DB_REAPING_FREQUENCY", 10)) %>
   timeout: 5000
 
 development:
   <<: *default
-  url: it61_development
+  database: it61_development
 
 test:
   <<: *default
-  url: it61_test
+  database: it61_test
 
 production:
   encoding: utf8