fix ref env (#28)

Author: freeznet

.github/workflows/goreleaser.yml

@@ -61,6 +61,8 @@ jobs:
 
       - name: Prepare Homebrew formula
         run: |
+          ref=${{ github.ref }}
+          tag=${ref#refs/tags/}
           cp ./dist/homebrew/Formula/snmcp.rb homebrew-streamnative/Formula/snmcp.rb
 
       - name: Create Homebrew PR
@@ -71,4 +73,6 @@ jobs:
           branch: snmcp/${{ env.tag }}
           title: Update snmcp to ${{ env.tag }}
           body: Automated changes by Release workflow in streamnative/streamnative-mcp-server repository.
-          delete-branch: true
+          delete-branch: true
+          committer: StreamNative Bot <[email protected]>
+          commit-message: Created by streamnative-mcp-server-release-workflow