fix: switch homebrew from cask to formula (#248)

homebrew_casks writes to Casks/runpodctl.rb but users install via the
formula at runpodctl.rb (root). brew install runpodctl always picks
the formula, so the cask updates were invisible.

switch to brews: which updates the formula that users actually use.
this matches what gh, terraform, goreleaser, and other go cli tools do.

Author: TimPietruskyRunPod

.goreleaser.yml

@@ -49,7 +49,7 @@ archives:
 release:
   prerelease: auto
 
-homebrew_casks:
+brews:
   - name: runpodctl
     homepage: "https://github.com/runpod/runpodctl"
     repository:
@@ -66,6 +66,8 @@ homebrew_casks:
     commit_author:
       name: runpod
       email: [email protected]
+    install: |
+      bin.install "runpodctl"
     ids: [default]
 
 checksum: