Setup PostgreSQL and add React on Rails gems

[justin808]

Summary

• Configure Rails with PostgreSQL database
• Add react_on_rails and shakapacker gems
• Setup database structure for PostgreSQL

Changes

• Add .ruby-version file for Ruby 3.3.4
• Configure PostgreSQL with database.yml
• Add pg, shakapacker, and react_on_rails gems
• Update CI workflow for PostgreSQL
• Add database structure (schema.rb, seeds.rb)
• Add minimal shakapacker configuration

Test plan

• PostgreSQL databases created successfully
• Database connection verified
• CI tests pass with PostgreSQL

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between a4e3880 and fee0207.

⛔ Files ignored due to path filters (1)

• Gemfile.lock is excluded by !**/*.lock

📒 Files selected for processing (7)

• .github/workflows/ci.yml (2 hunks)
• Gemfile (2 hunks)
• config/database.yml (1 hunks)
• config/initializers/assets.rb (0 hunks)
• config/shakapacker.yml (1 hunks)
• db/schema.rb (1 hunks)
• db/seeds.rb (1 hunks)

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch setup-postgres-and-gems

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