Update microsoft-pr.yml

Author: Saadnajmi

.github/workflows/microsoft-pr.yml

@@ -34,8 +34,9 @@ jobs:
   build-website:
     name: "Build the website"
     permissions: {}
+    if: github.base_ref == 'main'
     uses: ./.github/workflows/microsoft-build-website.yml
   npm-publish-dry-run:
     name: "NPM Publish (Dry Run)"
     permissions: {}
-    uses: ./.github/workflows/microsoft-npm-publish-dry-run.yml
+    uses: ./.github/workflows/microsoft-npm-publish-dry-run.yml