Improve MCP publisher install step in publish workflow

Use curl -fsSL for robust download, make the fetched mcp-publisher executable, and verify the installed version.

Author: jongalloway

.github/workflows/publish-nuget.yml

@@ -142,7 +142,9 @@ jobs:
 
       - name: Install MCP Publisher
         run: |
-          curl -L "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz" | tar xz mcp-publisher
+          curl -fsSL "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz" | tar xz mcp-publisher
+          chmod +x mcp-publisher
+          ./mcp-publisher --version
 
       - name: Login to MCP Registry
         run: ./mcp-publisher login github-oidc