This GitHub Action deploys using Kamal. Supports Kamal v2.0 and later.

To update the README to reflect the optional environment input, you can modify the usage section to indicate that environment is no longer required and explain how the action behaves when environment is omitted.

Here's how the README might look:

This GitHub Action deploys your application using Kamal and handles cancellation gracefully.

Note: All inputs are optional. Registry credentials (registry-username and registry-password) can be omitted if storing secrets anywhere except to GitHub Secrets (e.g. 1Password or LastPass). Any other necessary configuration, such as DATABASE_URL, REDIS_URL, and RAILS_MASTER_KEY, should be provided as environment variables in the workflow file.

steps:
  - name: Kamal Deploy
    uses: igor-alexandrov/kamal-deploy@v0.4.1
    with:
      # environment: 'staging'  # Optional, only used if provided
      registry-username: ${{ secrets.KAMAL_REGISTRY_USERNAME }} # Optional
      registry-password: ${{ secrets.KAMAL_REGISTRY_PASSWORD }} # Optional
    env:
      DATABASE_URL: ${{ secrets.DATABASE_URL }}
      REDIS_URL: ${{ secrets.REDIS_URL }}
      RAILS_MASTER_KEY: ${{ secrets.RAILS_MASTER_KEY }}

This action uses @vercel/ncc to bundle the source code and dependencies into a single file for distribution. Before publishing or committing updates to your action, you need to compile the code.

npm install @vercel/ncc --save-dev

ncc build index.js --out dist