Do not start Cypress on prebuild if not enabled

[cesarvarela]

I have a build that keeps "randomly" crashing when running it alongside Cypress. One thing I've noticed is that even when I have the plugin configured to run on postBuild, Cypress is started on preBuild, leaving less memory for the build process.

This is our netlify.toml:

[build.environment]
CYPRESS_CACHE_FOLDER = "./node_modules/CypressBinary"
TERM = "xterm"

[[plugins]]
 package = "@netlify/plugin-gatsby"

[[plugins]]
 package = "netlify-plugin-cypress"
 [plugins.inputs]
   enable = false
 [plugins.inputs.postBuild]
   record = true
   enable = true
   spa = true
   start = 'gatsby serve -p 8080'

And this is the build log:

3:20:22 PM: ​
3:20:22 PM: ────────────────────────────────────────────────────────────────
3:20:22 PM:   2. netlify-plugin-cypress (onPreBuild event)                  
3:20:22 PM: ────────────────────────────────────────────────────────────────
3:20:22 PM: ​
3:20:23 PM: [STARTED] Task without title.
3:20:24 PM: [SUCCESS] Task without title.
3:20:26 PM: [3820:0928/182026.128392:ERROR:gpu_memory_buffer_support_x11.cc(44)] dri3 extension not supported.
3:20:26 PM: Displaying Cypress info...
3:20:26 PM: Detected no known browsers installed
3:20:26 PM: Proxy Settings: none detected
3:20:26 PM: Environment Variables:
3:20:26 PM: CYPRESS_RECORD_KEY: <redacted>
3:20:26 PM: CYPRESS_CACHE_FOLDER: ./node_modules/CypressBinary
3:20:26 PM: CYPRESS_PROJECT_ID: 1w1vze
3:20:26 PM: Application Data: /opt/buildhome/.config/cypress/cy/development
3:20:26 PM: Browser Profiles: /opt/buildhome/.config/cypress/cy/development/browsers
3:20:26 PM: Binary Caches: /opt/build/repo/site/gatsby-site/node_modules/CypressBinary
3:20:26 PM: Cypress Version: 10.8.0 (stable)
3:20:26 PM: System Platform: linux (Ubuntu - 20.04)
3:20:26 PM: System Memory: 66.1 GB free 59.1 GB
3:20:26 PM: ​
3:20:26 PM: (netlify-plugin-cypress onPreBuild completed in 3.8s)
3:20:26 PM: ​
3:20:26 PM: ────────────────────────────────────────────────────────────────
3:20:26 PM:   3. Build command from Netlify app                             
3:20:26 PM: ────────────────────────────────────────────────────────────────
3:20:26 PM: ​
3:20:26 PM: $ gatsby build
3:20:28 PM: success compile gatsby files - 0.960s
3:20:29 PM: success load gatsby config - 0.190s
3:20:30 PM: success load plugins - 1.479s
3:20:30 PM: warning gatsby-plugin-react-helmet: Gatsby now has built-in support for modifying the document head. Learn more at https://gatsby.dev/gatsby-head

Cypress is started but is not used until the build finishes, I think it would make sense to start it when it is actually enabled, which is the postBuild step.

This is the complete log: https://app.netlify.com/sites/aiid/deploys/633490029dfb6400080b80ac