Force checkout for TM api

Author: Rub21

images/tasking-manager-api/Dockerfile

@@ -7,7 +7,7 @@ ENV workdir /usr/src/app
 
 RUN git clone https://github.com/hotosm/tasking-manager.git $workdir
 # Commits on Oct 23, 2020
-RUN cd $workdir && git checkout 951039f86938b9cc9d8b6986c4e5f3423a78e4d3
+RUN cd $workdir && git checkout -f 951039f86938b9cc9d8b6986c4e5f3423a78e4d3
 WORKDIR $workdir
 
 # Setup backend dependencies