feat: make Full variant opt-in on automated releases

[dubpixel]

Problem

The release matrix currently builds both lite and full variants on every automated Buttons version bump, doubling CI time (~2.5 hrs per full build × boards).

Proposed Solution

Add a build-full boolean input to release-action.yaml. The automated daily cron only builds lite. full is only built when explicitly requested via workflow_dispatch with build-full: true.

# release-action.yaml — workflow_dispatch inputs
build-full:
  description: 'Also build Full variant images (Buttons + Satellite + Companion)'
  required: false
  default: 'false'
  type: boolean

Then wrap the full entry in the matrix with an if or use a dynamic matrix via fromJSON.

Files to change

• .github/workflows/release-action.yaml — add input, conditional matrix

[dubpixel]

Shipped in f49bc41 — build-full boolean input added to workflow_dispatch, computed into a JSON variant list the matrix consumes via fromJSON(). Cron and default manual dispatch now only build lite; full is opt-in.