[ci] Ensure working directory is bin dir, otherwise the lib can't be found

Author: lemonmojo

.github/workflows/ci.yml

@@ -68,8 +68,8 @@ jobs:
     # TODO: Verify that transform actually returns the expected result
     - name: run C sample
       run: |
-        cd Samples/Beyond.NET.Sample.C
-        ./bin/transform 'abc123üiı'
+        cd "Samples/Beyond.NET.Sample.C/bin"
+        ./transform 'abc123üiı'
 
     - name: build Go sample (Linux)
       if: "success() && matrix.env.OS == 'linux'"