Docker environment improvements

[mateuscruz]

Summary

This PR refactors the Docker setup and improves the development workflow for the project.

🐳 Docker Infrastructure Improvements

• Reorganized PostgreSQL Docker files: Moved docker/postgres_primary.dockerfile and docker/postgres_replica.dockerfile to proper directory structures (docker/postgres_primary/Dockerfile and docker/postgres_replica/Dockerfile)
• Enhanced health checks: Added common health check configuration with improved timing (5s interval, 10s timeout, 30 retries)
• Better service dependencies: Updated docker-compose.yml to use proper health check conditions for service startup ordering
• Added persistent volumes: Added MariaDB, PostgreSQL primary, and replica volumes for data persistence
• Improved PostgreSQL replica startup: Replaced cmd.sh with a more robust start_server script that handles container restarts gracefully

🔧 Development Workflow Enhancements

• New execution helper: Added bin/exec-latest script to easily run commands against the latest Active Record version
• Better Dockerfile: Added default CMD to start IRB session for easier development
• Enhanced .dockerignore: Expanded to exclude more development artifacts and temporary files

📝 CI/CD Updates

• Updated GitHub Actions: Modified workflow files to reference the new Docker file locations
• Consistent SHA calculation: Updated all workflows to use the new file paths for cache invalidation

📦 Version Bump

• Bumped app image tag from v0.9.0.3 to v0.9.0.4

🛠️ Technical Improvements

• PostgreSQL replica resilience: The new startup script preserves existing data on container restarts, avoiding unnecessary full re-synchronization
• Better error handling: Added proper error handling and logging in the replica startup process
• Standardized file permissions: Ensured proper PostgreSQL data directory permissions

These changes improve the development experience, make the Docker setup more robust, and provide better tooling for working with multiple Active Record versions.

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Edit: this PR description was made with AI. The code changes are AI free 😎.

[malaguitte]

Looks good 🚀