Add git's sh to path to simplify branch cleanup

Author: foopoiuyt

buildbot-worker/Dockerfile

@@ -22,6 +22,12 @@ RUN Write-Host 'Installing buildbot ...'; `
 
 COPY BuildbotWorker C:/BW
 
+#--------------------------------------------------------------------
+# Make git sh available in path for branch cleanup
+#--------------------------------------------------------------------
+
+RUN Register-SystemPath -path 'C:\\program files\\git\\bin'
+
 #--------------------------------------------------------------------
 # Entrypoint
 #--------------------------------------------------------------------