Fix GoReleaser Homebrew tap auth with dedicated token

GITHUB_TOKEN can't push to a different repo. Use HOMEBREW_CONTROL_TOKEN
secret for cross-repo Homebrew cask formula push.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: StephanSchmidt

.github/workflows/release.yml

@@ -26,3 +26,4 @@ jobs:
           args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HOMEBREW_CONTROL_TOKEN: ${{ secrets.HOMEBREW_CONTROL_TOKEN }}

.goreleaser.yaml

@@ -23,6 +23,7 @@ homebrew_casks:
     repository:
       owner: StephanSchmidt
       name: homebrew-control
+      token: "{{ .Env.HOMEBREW_CONTROL_TOKEN }}"
     homepage: https://github.com/StephanSchmidt/control
     description: Generate SVG diagrams from plain text