cd into repo before installing requirements in docker file

Author: finsberg

docker/Dockerfile

@@ -7,4 +7,4 @@ WORKDIR /app
 # Copy pyproject.toml first so that we done need to reinstall in case anoter file
 # is changing ater rebuiding docker image
 RUN git clone --branch ${REPO_BRANCH} --single-branch https://github.com/scientificcomputing/example-paper-fenics.git
-RUN python3 -m pip install pip --upgrade && python3 -m pip install --no-cache-dir -r requirements.txt && rm -rf /tmp
+RUN cd example-paper-fenics && python3 -m pip install pip --upgrade && python3 -m pip install --no-cache-dir -r requirements.txt && rm -rf /tmp