Update build.yml

Author: aritchie

.github/workflows/build.yml

@@ -23,6 +23,12 @@ concurrency:
 
 jobs:
   build:
+    # Nerdbank.GitVersioning appends Git*Version lines to $GITHUB_ENV once per project. With parallel
+    # MSBuild (-m) the worker processes race on that file and tear lines, which the runner then rejects
+    # with "Invalid format '1.0.0'" at the end of the step. Nothing here consumes those variables.
+    env:
+      NBGV_SetCloudBuildVersionVars: false
+
     permissions:
       id-token: write   # required for NuGet trusted publishing (OIDC)
       contents: read