I see developers make a mistake that can ruin their entire month. They are building a new Rails SaaS. They get their Stripe secret key, their OpenAI key, and their AWS credentials. To deploy the app, they create a file called .env.production on their laptop, paste the keys inside, and deploy. Then, late on a Friday night, they accidentally type git add . and push that file to a public GitHub repository. Within exactly 4 seconds, automated bots scrape those keys. By Saturday morning, hackers have spun up $50,000 worth of crypto-mining servers on their AWS account. As a solo developer, you cannot afford this mistake. You need a system where your production secrets never touch a file that can be committed to Git. With the release of Kamal 2 , managing secrets has been completely overhauled. You can now pull your API keys directly from your password manager during the deployment process. Here is how to lock down your Rails app in 4 simple steps.…