feat: skip upload brew formula if no PAT

Signed-off-by: Lin Yang <[email protected]>

.goreleaser.yaml

@@ -112,9 +112,10 @@ brews:
     description: Lightweight service mesh for Kubernetes East-West and North-South traffic management
     license: Apache 2.0
     test: |
-      system "#{bin}/fsm --version"
+      system "#{bin}/fsm version"
     dependencies:
       - name: go
         type: optional
       - name: git
         type: optional
+    skip_upload: "{{ if index .Env 'HOMEBREW_RELEASE_PAT' }}false{{ else }}true{{ end }}"