Fix the build-test action (#1631)

This fixes the `build-test` action by restoring the `examples`
working directory.  This was incorrectly removed in the previous
commit.

Author: tekkamanendless

.github/workflows/build-test.yml

@@ -80,3 +80,4 @@ jobs:
 
       - name: Run Example
         run: go run .
+        working-directory: examples