Fix npm steps in publish-mcp.yml (#37)

Move actions/setup-node ahead of npm ci/build/test so the pinned Node 20 is actually used for them and the npm cache is restored before install, matching the order in ci-mcp.yml.

Author: albertospelta

.github/workflows/publish-mcp.yml

@@ -21,6 +21,13 @@ jobs:
         with:
           global-json-file: global.json
 
+      - uses: actions/setup-node@v6
+        with:
+          node-version: "20"
+          registry-url: "https://registry.npmjs.org"
+          cache: npm
+          cache-dependency-path: mcp/package-lock.json
+
       - uses: dotnet/nbgv@v0.4
         id: nbgv
         with:
@@ -38,13 +45,6 @@ jobs:
         working-directory: mcp
         run: npm test
 
-      - uses: actions/setup-node@v6
-        with:
-          node-version: "20"
-          registry-url: "https://registry.npmjs.org"
-          cache: npm
-          cache-dependency-path: mcp/package-lock.json
-
       # Stamp the Nerdbank.GitVersioning version into package.json
       - name: set version
         working-directory: mcp