Add PostgreSQL support and database matrix to CI

Add PostgreSQL gem as a development dependency and configure CI to run
tests against both SQLite and PostgreSQL databases. This ensures the
database-backed event processing works across both database systems.

Changes:
- Add PostgreSQL service container to GitHub Actions workflow
- Configure database matrix to run tests against sqlite3 and postgresql
- Add pg gem to Gemfile and Rails-specific gemfiles
- Update test database configuration with PostgreSQL connection details

Author: effron

.github/workflows/tests.yml

@@ -6,13 +6,29 @@ jobs:
   test:
     runs-on: ubuntu-latest
 
+    services:
+      postgres:
+        image: postgres:14
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: journaled_test
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
     strategy:
       fail-fast: false
       matrix:
         ruby: ['3.2', '3.3', '3.4']
         gemfile:
           - gemfiles/rails_7_2.gemfile
           - gemfiles/rails_8_0.gemfile
+        database: ['sqlite3', 'postgresql']
     steps:
     - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
     - uses: ruby/setup-ruby@e34163cd15f4bb403dcd72d98e295997e6a55798 # v1
@@ -21,7 +37,21 @@ jobs:
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Setup database
+      if: matrix.database == 'postgresql'
+      env:
+        DATABASE_ADAPTER: postgresql
+        DATABASE_USER: postgres
+        DATABASE_PASSWORD: postgres
+        DATABASE_HOST: localhost
+        BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+      run: |
+        bundle exec rake db:create db:schema:load
     - name: Run tests
       env:
         BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+        DATABASE_ADAPTER: ${{ matrix.database }}
+        DATABASE_USER: postgres
+        DATABASE_PASSWORD: postgres
+        DATABASE_HOST: localhost
       run: bundle exec rake spec

Gemfile

@@ -4,4 +4,5 @@ source 'https://rubygems.org'
 
 gemspec
 
+gem 'pg'
 gem 'sqlite3', '>= 2.1'

Gemfile.lock

@@ -119,6 +119,8 @@ GEM
     parser (3.3.7.0)
       ast (~> 2.4.1)
       racc
+    pg (1.6.2-arm64-darwin)
+    pg (1.6.2-x86_64-linux)
     pp (0.6.2)
       prettyprint
     prettyprint (0.2.0)
@@ -245,6 +247,7 @@ DEPENDENCIES
   appraisal
   betterlint
   journaled!
+  pg
   rspec-rails
   rspec_junit_formatter
   spring

gemfiles/rails_7_2.gemfile

@@ -2,6 +2,7 @@
 
 source "https://rubygems.org"
 
+gem "pg"
 gem "sqlite3", ">= 1.4"
 gem "railties", "~> 7.2.0"
 

gemfiles/rails_7_2.gemfile.lock

@@ -119,6 +119,8 @@ GEM
     parser (3.3.7.0)
       ast (~> 2.4.1)
       racc
+    pg (1.6.2-arm64-darwin)
+    pg (1.6.2-x86_64-linux)
     pp (0.6.2)
       prettyprint
     prettyprint (0.2.0)
@@ -244,6 +246,7 @@ DEPENDENCIES
   appraisal
   betterlint
   journaled!
+  pg
   railties (~> 7.2.0)
   rspec-rails
   rspec_junit_formatter

gemfiles/rails_8_0.gemfile

@@ -2,6 +2,7 @@
 
 source "https://rubygems.org"
 
+gem "pg"
 gem "sqlite3", ">= 2.1"
 gem "railties", "~> 8.0.0"
 

gemfiles/rails_8_0.gemfile.lock

@@ -119,6 +119,8 @@ GEM
     parser (3.3.7.0)
       ast (~> 2.4.1)
       racc
+    pg (1.6.2-arm64-darwin)
+    pg (1.6.2-x86_64-linux)
     pp (0.6.2)
       prettyprint
     prettyprint (0.2.0)
@@ -245,6 +247,7 @@ DEPENDENCIES
   appraisal
   betterlint
   journaled!
+  pg
   railties (~> 8.0.0)
   rspec-rails
   rspec_junit_formatter

spec/dummy/config/database.yml

@@ -1,6 +1,26 @@
+<% if ENV['DATABASE_ADAPTER'] == 'postgresql' %>
+test:
+  adapter: postgresql
+  encoding: unicode
+  database: journaled_test
+  username: <%= ENV['DATABASE_USER'] || 'postgres' %>
+  password: <%= ENV['DATABASE_PASSWORD'] || 'postgres' %>
+  host: <%= ENV['DATABASE_HOST'] || 'localhost' %>
+  port: <%= ENV['DATABASE_PORT'] || 5432 %>
+
+development:
+  adapter: postgresql
+  encoding: unicode
+  database: journaled_development
+  username: <%= ENV['DATABASE_USER'] || 'postgres' %>
+  password: <%= ENV['DATABASE_PASSWORD'] || 'postgres' %>
+  host: <%= ENV['DATABASE_HOST'] || 'localhost' %>
+  port: <%= ENV['DATABASE_PORT'] || 5432 %>
+<% else %>
 development:
   adapter: sqlite3
   database: ":memory:"
 test:
   adapter: sqlite3
   database: ":memory:"
+<% end %>