Ignore reusable workflow when initializing repo

Author: kzu

.netconfig

@@ -25,3 +25,9 @@
 [file "src/kzu.snk"]
 	url = https://github.com/devlooped/oss/blob/main/src/kzu.snk
 	skip	
+
+# reusable workflows not intended for standalone execution
+[file ".github/workflows/dotnet-file-core.yml"]
+	url = https://github.com/devlooped/oss/blob/main/.github/workflows/dotnet-file-core.yml
+	skip
+