[ci] Change conda install location (#1855)

* Update Dockerfile

* Update Dockerfile

* chmod conda folder

.ci/dockers/ubuntu-14.04/Dockerfile

@@ -43,13 +43,14 @@ RUN curl -sL https://cmake.org/files/v3.12/cmake-3.12.0-Linux-x86_64.sh -o cmake
 # Install Miniconda
 RUN curl -sL https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -o miniconda.sh \
  && chmod +x miniconda.sh \
- && ./miniconda.sh -b -p /usr/local/miniconda \
+ && ./miniconda.sh -b -p /opt/conda \
  && rm miniconda.sh \
- && chmod -R 777 /usr/local/miniconda \
- && /usr/local/miniconda/bin/conda install python=3 -q -y \
- && /usr/local/miniconda/bin/conda install mkl qt -q -y \
- && /usr/local/miniconda/bin/conda clean -a -y
-ENV CONDA=/usr/local/miniconda
+ && /opt/conda/bin/conda install python=3 -q -y \
+ && /opt/conda/bin/conda install mkl qt -q -y \
+ && /opt/conda/bin/conda clean -a -y \
+ && chmod -R 777 /opt/conda
+ 
+ENV CONDA=/opt/conda/
 
 # Clean system
 RUN apt-get clean \