Update Dockerfile

Adjusted dockerfile as error raised from untracked PLATFORM file

Author: edwardsmith999

Dockerfile

@@ -9,13 +9,15 @@ MAINTAINER Edward Smith <[email protected]>
 # Check if CPL library needs to be updated, this is required as cplopenfoam 
 # will contain an old version of CPL library and this can easily be updated
 WORKDIR /cpl-library
-RUN git pull && \
+RUN git fetch --all && \
+    git reset --hard origin/master && \
     make PLATFORM=gcc clean && \ 
     make PLATFORM=gcc
 
 #We need to update the app to the latest code, patch OpenFOAM and build solvers
 WORKDIR $APP_DIR
-RUN git pull
+RUN git fetch --all && \
+    git reset --hard origin/master
 RUN /bin/bash -c "source SOURCEME.sh && \
     make clean && \ 
     make pstream && \