Merge pull request microsoft#1926 from mjcheetham/ci-workflow-customname

build: add run_name input to support cross-repo automation

Author: mjcheetham

.github/workflows/build.yaml

@@ -1,5 +1,7 @@
 name: VFS for Git
 
+run-name: ${{ inputs.run_name || 'VFS for Git' }}
+
 on:
   pull_request:
     branches: [ master, releases/shipped ]
@@ -11,6 +13,10 @@ on:
         description: 'Microsoft Git version tag to include in the build (leave empty for default)'
         required: false
         type: string
+      run_name:
+        description: 'Optional display name for this run (used for cross-repo automation)'
+        required: false
+        type: string
 
 permissions:
   contents: read