### Configure build and start for Sinatra

#### Summary
Build and start for a Sinatra app on Ample. Verified on Sinatra: the app built and started with the documented commands and answered on its public HTTPS URL. Build and start: bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rackup` (config.ru) reading PORT on the ruby-3.4 template.

#### Prerequisites
- A Sinatra project (bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rackup` (config.ru) reading PORT on the ruby-3.4 template)
- An Ample account token with servers:write

#### Workflow Steps
1. **Build and start**  
bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rackup` (config.ru) reading PORT on the ruby-3.4 template; the server must bind 0.0.0.0 on PORT.
2. **Deploy**  
Run the synchronous deploy once and read the result.  
`ample deploy . --name  --public`
3. **Verify**  
Fetch the live URL on the example; on failure read the build and runtime logs.  
`ample logs  --kind build`

#### Tested Configuration
- **Template:** ruby-3.4  
- **Runtime:** ruby  
- **Size:** s-1vcpu-1gb  
- **Install Command:** `bundle config set --local path vendor/bundle && bundle config set --local without 'development test' && bundle install`  
- **Start Command:** `bundle exec rackup -o 0.0.0.0 -p $PORT`

#### Limitations
- Verified on the ruby-3.4 template at s-1vcpu-1gb; other sizes and Sinatra major versions are not verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.

#### Cost Estimate
- **Currency:** USD  
- **Monthly Amount:** 5.0  
- **Basis:** size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty  
- **Components:**  
  - Name: app server  
  - Size: s-1vcpu-1gb  
  - Quantity: 1.0  
  - Monthly Amount: 5.0  
- **Note:** Always-on monthly price of the tested sizes; apps auto-pause when idle.

#### Examples
- **Title:** Sinatra pattern fixture  
**Description:** Verified build and start on Sinatra.  
**Source Reference:** tests/deploy-canaries/sinatra-patterns

#### Success Checks
- **Description:** app responds on its public URL  
- **Kind:** http_get  
- **Path:** /  
- **Expect:** ample canary sinatra patterns

#### Evidence Summary
- **Kind:** canary_run
- **Summary:** Sinatra pattern fixture deployed on Ample (bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rackup` (config.ru) reading PORT on the ruby-3.4 template); for this guide: the app built and started with the documented commands and answered on its public HTTPS URL.
- **Observed At:** 2026-09-20T23:45:31Z  
- **Implementation Revision:** 4d1511e574302f3904b75088bd4048a0975218b3-dirty (CLI 0.1.21)  
- **Expires At:** 2027-03-19T23:45:31Z

#### Last Verified At
2026-09-20T23:45:31Z