Update to add version request to make sure sh is available

Author: foopoiuyt

buildbot-worker/Dockerfile

@@ -26,7 +26,8 @@ COPY BuildbotWorker C:/BW
 # Make git sh available in path for branch cleanup
 #--------------------------------------------------------------------
 
-RUN Register-SystemPath -path 'C:\\program files\\git\\bin'
+RUN Register-SystemPath -path 'C:\program files\git\bin'; `
+    sh --version
 
 #--------------------------------------------------------------------
 # Entrypoint