fix: update MCP Publisher installation command to support multiple OS architectures

🏠 Remote-Dev: homespace

Author: domdomegg

docs/guides/publishing/github-actions.md

@@ -60,7 +60,7 @@ jobs:
 
       - name: Install MCP Publisher
         run: |
-          curl -L "https://github.com/modelcontextprotocol/registry/releases/download/v1.0.0/mcp-publisher_1.0.0_linux_amd64.tar.gz" | tar xz mcp-publisher
+          curl -L "https://github.com/modelcontextprotocol/registry/releases/download/v1.0.0/mcp-publisher_1.0.0_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz" | tar xz mcp-publisher
       
       - name: Login to MCP Registry
         run: ./mcp-publisher login github-oidc